Eversharp: The Mechanical Pencil Patent Its Own Inventor Lost in Two Years

By Matthew Partsch · Owl and Twig Vintage · October 2, 2026

Charles Keeran filed the patent, built the trademark, and sold the first pencils out of a storefront in Bloomington, Illinois, in the winter of 1913. Two years after a Chicago adding-machine company agreed to manufacture them, that company owned Keeran's own invention outright — and the clip collectors check for on a "classic" Eversharp today wasn't even his design.

What an Eversharp pencil actually is

An Eversharp is a propelling, or "automatic," pencil: twist the knob at the end and a mechanism inside advances a thin graphite lead through the tip, so the pencil never needs sharpening and never gets shorter to hold. That basic mechanism — a threaded follower turning inside a hollow magazine that both stores spare leads and drives the follower — is not a design flourish. It's the exact claim of a 1913 patent, and almost every mechanical pencil made since has some version of the same idea inside it.

The earliest Eversharps were made in sterling silver, gold-filled and base metal by a Massachusetts metalworking contractor, sold through a Bloomington, Illinois storefront, and by the early 1920s were rolling off a Chicago factory floor at tens of thousands a day. This guide follows the pencil from the inventor's own patent filing through the company that took it from him, the near-identical story that was unfolding independently in Japan at the same moment, and what the surviving pencils — pre-takeover and after — actually look like and sell for today.

The Illinois inventor behind the patent

Charles Rood Keeran was born in 1883 on a farm near Bloomington, Illinois, earned an engineering degree, and had already sold one invention — a two-piece vacuum seal for Mason jars that became a home-canning standard — before he turned to pencils. He filed US Patent 1,130,741 on October 10, 1913, covering a chambered pencil body with a threaded follower, a lead-storing magazine that doubles as the actuating mechanism, and a funnel-shaped guide to center each new lead as it's inserted. The patent lists no assignee. It was Keeran's alone, and it was granted March 9, 1915.

He filed a second patent on October 28, 1914 — US 1,151,016, granted August 24, 1915 — covering the internal ribs that grip the lead firmly enough to stop it wobbling or slipping back without a company's help, also unassigned. The name came at the same time as the mechanism: Keeran coined "Eversharp" and designed its spiky lettering after the logo on a Winchester rifle, aiming for the same impression of precision engineering.

The first pencils were ready by mid-December 1913, manufactured under contract by the Heath Company — sterling-silver models carry Heath's small "H" hallmark alongside the Eversharp name, since Keeran hadn't yet built his own factory. Keeran test-marketed them at Wanamaker's department store in New York that Christmas, then incorporated Keeran & Co. in Bloomington in early 1914 and moved the whole operation to Chicago in the late summer of 1915, chasing a bigger manufacturing partner.

How a manufacturing deal became a takeover

Keeran went to the Wahl Adding Machine Company in Chicago looking to buy machinery. Wahl offered to manufacture the pencils instead, and the two sides signed a contract around October 1915. In mid-November 1915, with his own company's production lagging behind its orders, Keeran accepted a $20,000 capital infusion from Wahl in exchange for a controlling interest. Production stayed slow through 1916, and by the end of that year Wahl had absorbed what remained of Keeran's company entirely through a stock exchange — leaving Keeran with a minority stake and the title of sales manager in a business that was, by then, no longer really his.

Keeran stayed useful for a while. In November 1916 he negotiated Wahl's option to buy the Boston Safety Fountain Pen Company, the deal that got Wahl into the pen business alongside pencils, and he spent the next year making regular trips to New York to settle patent disputes on the company's behalf. None of it bought him security: he was replaced as sales manager in August 1917, and his resignation was formally accepted on December 20, 1917 — four years, almost to the month, after he'd filed the patent the whole company was built on.

By 1921, four years after Wahl took over manufacturing, the company was producing 35,000 Eversharps a day and had sold more than twelve million units since Keeran's original 1913 launch. Keeran, for his part, kept inventing: he registered the "Autopoint" trademark in 1919, helped found the Realite Pencil Company in 1921 — later renamed the Autopoint Company — and continued filing pencil patents assigned to Autopoint, Realite and Durolite until his death in Chicago on June 9, 1948.

The clip that isn't his

Keeran didn't stop designing after the Wahl deal. He filed a design patent for a "trowel clip" on April 4, 1916 — US Design Patent 49,743, granted that October 10 — his last credited design contribution before the buyout finished. (Google Patents' own digitized record spells his name "Charles R. Keeban" on this filing, almost certainly a scanning error rather than a second inventor; every other record for this pencil, including Keeran's own earlier patents, spells it Keeran.) The trowel clip replaced an even earlier one: Heath's own pierced-base prong clip, patented separately on July 6, 1915 and used on the very first Eversharps before Keeran had designed anything of his own for the job.

Neither clip lasted. US Patent 1,279,186 — filed March 8, 1917, the same year Keeran's position was being quietly dismantled, and granted September 17, 1918 — covers a flexible, flanged clip that anchors inside the pencil's tube without rivets. Its inventors are John C. Wahl, the company's own namesake, and William H. Odlum. This is the clip that defines a "classic" Eversharp in collectors' minds today, and it wasn't Keeran's design at all. It was the company's answer to him, filed in the same window he was being replaced.

How to tell a pre-Wahl Eversharp

Specialist pen-and-pencil dealers track a consistent set of markings that separate a Keeran-era pencil from the Wahl-made pencils that followed, built on the clip history above and on the lettering stamped into the metal itself.

Era	Stamped name	Clip	Other tells
Keeran & Co. / Heath-made (1913–1916)	"EVER SHARP" — a visible space between the two words	Heath's pierced-base prong clip, or Keeran's own trowel clip from 1916	Gold-filled models read "20 YEAR GOLD FILLED"; sterling models carry Heath's small "H" hallmark; hand-engraved or engine-turned decoration shows up on sterling examples that later Wahl production dropped
Early Wahl (1917–late 1920s)	"EVERSHARP" — solid, no space	Wahl's flat prong clip, patent 1,279,186	Gold-filled models read plain "GOLD FILLED"; decoration becomes plainer and more standardized as output scales up
Wahl-Eversharp (late 1920s onward)	"Wahl Eversharp," pen and pencil lines branded together	Flat clip, later redesigned across named model lines	Named models appear — Doric, Equi-Poised — and materials expand from metal into colored celluloid and plastic by the 1930s

A second "Sharp" pencil, invented independently in Japan

In 1915, a 21-year-old metalworker in Japan named Hayakawa Tokuji invented his own mechanical pencil, with no contact with Keeran, no shared patent, and no business relationship of any kind — two inventors reaching a similar idea an ocean apart within about two years of each other. Hayakawa's version was successful enough in Japan that it was renamed the "Ever-Ready Sharp Pencil." Sharp Corporation's own company history states plainly that this renaming "became the origin of 'Sharp,' the subsequent name of the company" — the electronics maker's name traces directly back to a pencil, not a radio or a calculator.

Hayakawa patented his mechanism in Japan in 1920 and in the United States as Patent 1,578,515, filed July 11, 1923 and granted March 30, 1926 — a removable clip-based way of joining the pencil's internal tubes without solder, so a damaged part could be replaced rather than the whole assembly thrown out. The Great Kantō earthquake of September 1, 1923 destroyed his factory and killed members of his family; he sold the patent rights to an Osaka stationery maker to cover debts, relocated to Osaka that December, and within about a year had pivoted entirely to radios. By April 1925 — confirmed on Sharp's own corporate history site — Hayakawa and his associates had assembled Japan's first crystal radio, the business that eventually became Sharp Corporation.

For about twenty years, collector literature conflated the two pencils into a single, incorrect story — that Wahl had bought the rights to Keeran's pencil from a source in Japan. A specialist pen-history source corrected the record directly: they are two unrelated inventions with two separate patent trails, and the only real connection between them is the coincidence of timing and the word "sharp" itself.

What they sell for

No realized, dated auction price for an early Keeran-era or first-generation Wahl Eversharp turned up in the sources checked for this guide — these pencils mostly change hands through specialist pen dealers and general marketplace listings rather than major auction houses, so this section gives asking prices only, clearly labeled as such.

A specialist vintage-pen dealer's own catalog lists individual Eversharp and Wahl-Eversharp pencils from roughly $50 to $200 depending on model, material and condition. Within that range, early trowel-clip examples from around 1916 — the design patented by Keeran himself just before the buyout — are priced toward the higher end, around $120 to $150, while common 1920s gold-filled ringtop models sit closer to $50 to $85. Current eBay listings for ordinary sterling Wahl Eversharp pencils, none dated earlier than about 1917 in their own descriptions, ask roughly $25 to $125, also unverified as to whether any have actually sold at those prices.

Where the records disagree

The clearest documented trademark registration found for "Eversharp" is a 1932 filing — registered October 4, 1932, for fountain pens specifically, under the name Eversharp Pen Company — that nonetheless claims first use in commerce back in December 1913, the month the original pencil launched. No earlier, pencil-specific registration from the 1915–1916 period turned up in the sources checked for this guide. That doesn't mean one never existed; it means this guide can only report what was found, not what might be missing from an incomplete search of a century-old trademark record.

The company itself kept changing hands and names long after Keeran died. Wahl rebranded as "Wahl-Eversharp" in the late 1920s, simplified to plain "Eversharp" in 1941, then damaged itself badly by entering the ballpoint-pen market — Eversharp and the Parker Pen Company together sued a competitor, Fisher Pen Co., over ballpoint patents they'd licensed from László Bíró, and won outright in 1961 (Eversharp, Inc. v. Fisher Pen Co., 204 F. Supp. 649, N.D. Ill., decided November 7, 1961) — but the win came too late to save the business. Parker Pen Company bought Eversharp outright in 1957, and the name persisted on accessories only until 1999. A modern revival, now trading as Eversharp Holdings LLC, has filed three new federal trademark applications since September 2023 covering pens under the Wahl-Eversharp name — so, in trademark law at least, the name Keeran coined in 1913 is still an open, active question well over a century later.

For another writing-instrument patent that outlived the inventor who filed it, see this shop's guide to the pencil eraser patent the Supreme Court threw out. For a fountain-pen maker from the same era with its own patent history, see the guide to the Waterman fountain pen. For the rest of the Field Guides library, see the Field Guides index.