US3848723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adapter key caps
Assignee: Individual
•
Filing: 1973-07-23
•
Granted: 1974-11-19
•
Expires: 1993-07-23
Abstract
Abstract An adapter key cap reduces the possibility of typographical errors on a modern typewriter having character and service keys arranged and aligned in parallel rows. A raised, beveled projection disposed on the key cap allows a typist to tactically know when the fingers are properly positioned on the ''''home keys''''. When a typist is frequently interrupted by other office tasks, a considerable savings in time is assured by the invention since there is no time wasted visually checking the positioning of the fingers after each interruption.
Inventors
- 👤 L Hogue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:52
CPC Classifications
B; B41; B41J; B41J5/00; B41J5/08; B41J5/12; H; H01; H01H; H01H2217/00; H01H2217/024; H01H2221/00; H01H2221/066
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
139 words
In a typewriter having character and service keys arranged in aligned parallel rows and all being uniformly shaped with concave upper surfaces, an improvement therefor is provided comprising: an adapter key cap fabricated from a lightweight material and having a shell-like wall appearance and further having the configuration of a lower-open-ended hollow pyramidal frustum sized to snugly fit over particular ones of said keys, the closed upper surface of the pyramidal frustum is flat except for being provided with a single outwardly facing beveled projection along its rear perimeter having a cross-sectional shape defining an angle greater than ninety degrees at its apex to reduce the possibility of irritating a typist''s fingers and to allow tactile identification, and the underside of the closed upper surface is coated with an adhesive to ensure connection to particular ones of said keys.
Claim 2
Dependent Claim
139 words
In a typewriter having character and service keys arranged in aligned parallel rows and all being uniformly shaped with concave upper surfaces, an improvement therefor is provided comprising: an adapter key cap fabricated from a lightweight material and having a shell-like wall appearance and further having the configuration of a lower-open-ended hollow pyramidal frustum sized to snugly fit over particular ones of said keys, the closed upper surface of the pyramidal frustum is flat except for being provided with a single outwardly facing beveled projection along its rear perimeter having a cross-sectional shape defining an angle greater than ninety degrees at its apex to reduce the possibility of irritating a typist''s fingers and to allow tactile identification, and the underside of the closed upper surface is coated with an adhesive to ensure connection to particular ones of said keys.
Claim 3
Dependent Claim
32 words
An improvement according to claim 1 in which there are provided at least three outwardly facing beveled projections arranged in a side-by-side relationship to give the closed upper surface a corrugated configuration.
References Cited (Backward Citations)
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Cited
US1041696A
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US1148721A
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US1823130A
Cited
US2484886A
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US3396827A
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US3648394A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |