Patent US2277512A successfully refreshed from Google Patents.
US3971013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Touch keyboard
Assignee: International Business Machines Corp
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Filing: 1975-04-23
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Granted: 1976-07-20
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Expires: 1995-04-23
Abstract
Abstract A touch operated keyboard comprising an AC driven gas discharge panel display with conductive touch keys located to pick up an AC voltage from the stray field generated by the gas discharge panel is disclosed. A detector detects the drop in AC voltage level of a key due to the proximity of an operator's finger. The touch keys may be deposited upon the surface of the gas panel or upon a separate transparent sheet. The keyboard may be operated to change the information displayed by the gas panel.
Inventors
- 👤 Francis Loyola Challoner
- 👤 Hemmige Desikachar Varadarajan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:01
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/048; G06F3/0487; G06F3/0488; G06F3/03; G06F3/041; G06F3/044; H; H03; H03K; H03K17/00; H03K17/94; H03K17/96; H03K17/962; H03K17/9622; H03K17/965; H03K17/975; H03K17/98; H03K2017/9602; H03K2017/9604; H03K2017/9613; H03K2217/00; H03K2217/94; H03K2217/96; H03K2217/9607; H03K2217/960735; H03K2217/960745
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
62 words
A touch operated keyboard comprising: an AC driven gas discharge panel display; at least one conductive touch key located proximate said display to pick up an AC voltage from said stray field generated by the gas discharge panel; and means to detect the drop in AC voltage level of said at least one key due to the proximity of an operator's finger.
Claim 2
Dependent Claim
62 words
A touch operated keyboard comprising: an AC driven gas discharge panel display; at least one conductive touch key located proximate said display to pick up an AC voltage from said stray field generated by the gas discharge panel; and means to detect the drop in AC voltage level of said at least one key due to the proximity of an operator's finger.
Claim 3
Dependent Claim
39 words
A keyboard as claimed in claim 1, in which each touch key overlays a display position on the gas discharge panel and the touch key is operable to change the information displayed in that position and/or any other positions.
Claim 4
Dependent Claim
25 words
A keyboard as claimed in claim 1 in which said conductive key comprises a metallic layer deposited upon a surface of the gas discharge panel.
Claim 5
Dependent Claim
39 words
A keyboard as claimed in claim 3, in which each touch key overlays a display position on the gas discharge panel and the touch key is operable to change the information displayed in that position and/or any other positions.
Claim 6
Dependent Claim
14 words
A keyboard as claimed in claim 3, in which said metallic layer is transparent.
Claim 7
Dependent Claim
39 words
A keyboard as claimed in claim 5, in which each touch key overlays a display position on the gas discharge panel and the touch key is operable to change the information displayed in that position and/or any other positions.
Claim 8
Dependent Claim
37 words
A keyboard as claimed in claim 1 in which said conductive key comprises a metallic layer upon a sheet of transparent insulating material, and; said transparent sheet is placed over the surface of said gas discharge panel.
Claim 9
Dependent Claim
39 words
A keyboard as claimed in claim 7, in which each touch key overlays a display position on the gas discharge panel and the touch key is operable to change the information displayed in that position and/or any other positions.
Claim 10
Dependent Claim
14 words
A keyboard as claimed in claim 7, in which said metallic layer is transparent.
Claim 11
Dependent Claim
39 words
A keyboard as claimed in claim 9, in which each touch key overlays a display position on the gas discharge panel and the touch key is operable to change the information displayed in that position and/or any other positions.
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) | 1979-07-20 | 1980-01-19 | 1980-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-20 | 1984-01-19 | 1984-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-20 | 1988-01-19 | 1988-07-20 | $7700.00 | Window Closed / Lapsed |