Patent US5120938A successfully refreshed from Google Patents.
US5120938A
Expired / Lapsed
US
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Keyboard having convex curved surface
Assignee: ROLLASON ENTERPRISE LLC
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Filing: 1991-04-26
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Granted: 1992-06-09
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Expires: 2011-04-26
Abstract
Abstract A lap top keyboard is provided having an outwardly curved center for user mfort and efficiency. The lap support on an underside of the keyboard is recessed, allowing the keyboard to extend downward to an outside of the user's thighs.
Inventors
- 👤 Samuel H. Rollason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:25
CPC Classifications
B; B41; B41J; B41J5/00; B41J5/08; B41J5/10; G; G06; G06F; G06F3/00; G06F3/01; G06F3/02; G06F3/0202
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
93 words
A keyboard comprising: (a) a base having first and second ends and a center portion curved upward between said ends to be positionable on a supporting structure during use of said keyboard, said center portion having an axis of curvature which is parallel to a line of sight of a user; and (b) a set of keys positioned on said upwardly curved center portion of said base to form an arch having an exterior surface facing away from said supporting structure, said surface having a convex shape, and said keys having uppermost portions.
Claim 2
Dependent Claim
93 words
A keyboard comprising: (a) a base having first and second ends and a center portion curved upward between said ends to be positionable on a supporting structure during use of said keyboard, said center portion having an axis of curvature which is parallel to a line of sight of a user; and (b) a set of keys positioned on said upwardly curved center portion of said base to form an arch having an exterior surface facing away from said supporting structure, said surface having a convex shape, and said keys having uppermost portions.
Claim 3
Dependent Claim
31 words
A keyboard according to claim 1 further comprising a lap support connected to said base in a position to rest on the thighs of said user during use of said keyboard.
Claim 4
Dependent Claim
47 words
A keyboard according to claim 1 wherein said center portion is constructed to have a front edge and a rear edge, and said keys are positioned having the uppermost portions extending from said front edge to said rear edge at a uniform height from said center portion.
Claim 5
Dependent Claim
16 words
A keyboard according to claim 3 wherein said rear edge is raised above said front edge.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-09 | 1995-12-09 | 1996-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-09 | 1999-12-09 | 2000-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-09 | 2003-12-09 | 2004-06-09 | $7700.00 | Window Closed / Lapsed |