US4293754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thin and flat keyboard integral with a metallic housing
Assignee: Sharp Corp
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Filing: 1979-12-28
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Granted: 1981-10-06
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Expires: 1999-12-28
Abstract
Abstract A keyboard construction including a metallic flat housing member and a metallic flat key actuator member closely laid upon the metallic flat housing member. The former has apertures in positions to correspond to respective ones of key actuator sections while the latter has cutouts to make respective ones of key actuators formed therein movable in a vertical direction. Key indicia are defined on the tops of the respective key actuators during the etching of the two members.
Inventors
- 👤 Shigeki Komaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:00
CPC Classifications
H; H01; H01H; H01H13/00; H01H13/70; H01H13/78; H01H13/785; H01H13/702; H01H2201/00; H01H2201/022; H01H2201/032; H01H2209/00; H01H2209/014; H01H2209/068; H01H2209/07; H01H2219/00; H01H2219/028; H01H2219/034; H01H2221/00; H01H2221/002; H01H2221/004; H01H2223/00; H01H2223/008; H01H2223/034; H01H2227/00; H01H2227/002; H01H2227/004; H01H2229/00; H01H2229/016; H01H2231/00; H01H2231/002
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
126 words
A thin keyboard construction for a handheld calculator which comprises a housing member and a key actuator sheet containing a plurality of key actuators which are integral with said key actuator sheet, said housing member being made of a sheetlike flat material having a portion of its area with a reduced thickness, said key actuator sheet being disposed in said area of reduced thickness, said area of reduced thickness having apertures disposed therein in positions corresponding to said plurality of key actuators, said key actuator sheet being made of a sheet like flat material having cutout portions defining said plurality of key actuators, said cutout portions enabling said key actuator to move in a vertical direction, and said cutout portions being concealed behind said housing member.
Claim 2
Dependent Claim
126 words
A thin keyboard construction for a handheld calculator which comprises a housing member and a key actuator sheet containing a plurality of key actuators which are integral with said key actuator sheet, said housing member being made of a sheetlike flat material having a portion of its area with a reduced thickness, said key actuator sheet being disposed in said area of reduced thickness, said area of reduced thickness having apertures disposed therein in positions corresponding to said plurality of key actuators, said key actuator sheet being made of a sheet like flat material having cutout portions defining said plurality of key actuators, said cutout portions enabling said key actuator to move in a vertical direction, and said cutout portions being concealed behind said housing member.
Claim 3
Dependent Claim
22 words
A keyboard construction according to claim 1 wherein said housing member and said key actuator sheet are made of a metallic material.
Claim 4
Dependent Claim
19 words
A keyboard construction according to claim 1 wherein key indicia are formed on the tops of said key actuators.
References Cited (Backward Citations)
US3290439A
Cited
US3627935A
Cited
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Cited
US3979568A
Cited
US4066860A
Cited
US4160886A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-05 | 1985-04-06 | 1985-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-05 | 1989-04-06 | 1989-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-05 | 1993-04-06 | 1993-10-06 | $7700.00 | Window Closed / Lapsed |