US4075465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Keyboard overlay
Assignee: Unisys Corp
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Filing: 1976-05-19
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Granted: 1978-02-21
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Expires: 1996-05-19
Abstract
Abstract An exchangeable overlay for changing the character representations associated with the keys of a keyboard. The overlay is disposed on the keyboard and has openings to receive each key thereof with the inner portion of each opening above an associated key sloped to form a character bearing surface of easy visibility.
Inventors
- 👤 Buddy Keith Funk
- 👤 Elton Earl Tetrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:13
CPC Classifications
B; B41; B41J; B41J5/00; B41J5/08; B41J5/10; B41J5/102; H; H01; H01H; H01H2219/00; H01H2219/002; H01H2223/00; H01H2223/034; H01H2223/036
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
66 words
A structure for mounting on a keyboard containing a plurality of keys, comprising in combination: an overlay disposable on the keyboard and having a plurality of inside surfaces defining openings for each of the keys of the keyboard; and a portion of at least some of said inside surfaces, which define said openings, being sloped and displaying a symbol associated with respective ones of said keys.
Claim 2
Dependent Claim
66 words
A structure for mounting on a keyboard containing a plurality of keys, comprising in combination: an overlay disposable on the keyboard and having a plurality of inside surfaces defining openings for each of the keys of the keyboard; and a portion of at least some of said inside surfaces, which define said openings, being sloped and displaying a symbol associated with respective ones of said keys.
Claim 3
Dependent Claim
43 words
A structure according to claim 1, wherein said portions of the respective inside surfaces each has a symbol formed thereon and will be disposed adjacent an upper side of its respective one of the keys when said overlay is disposed on said keyboard.
Claim 4
Dependent Claim
29 words
A structure according to claim 1, wherein said each inside surface portion is slanted away from its respective key to provide easy visibility of the symbol on said portion.
Claim 5
Dependent Claim
57 words
In combination: a keyboard comprising a plurality of keys; an exchangeable overlay having a like plurality of inside surfaces defining openings to receive said keys of said keyboard; and a portion of at least some of said inside surfaces, which define said openings, being sloped and displaying a symbol for association with respective ones of said keys.
Claim 6
Dependent Claim
57 words
In combination: a keyboard comprising a plurality of keys; an exchangeable overlay having a like plurality of inside surfaces defining openings to receive said keys of said keyboard; and a portion of at least some of said inside surfaces, which define said openings, being sloped and displaying a symbol for association with respective ones of said keys.
Claim 7
Dependent Claim
33 words
The combination of claim 4, wherein said portions of said respective inside surfaces each has a symbol formed thereon and is disposed adjacent an upper side of its respective one of said keys.
Claim 8
Dependent Claim
27 words
The combination of claim 4, wherein said each inside surface portion slopes away from its respective key to provide easy visibility of said symbol on said portion.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |