US3503031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printed circuit keyboard
Assignee: Control Data Corp
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Filing: 1969-02-11
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Granted: 1970-03-24
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Expires: 1989-02-11
Abstract
No abstract record available.
Inventors
- 👤 Keith A Nyhus
- 👤 Richard M Sedro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:51
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/94; H03K17/965; H03K17/967; G; G06; G06C; G06C7/00; G06C7/02; H01; H01C; H01C10/00; H01C10/10; H01C10/106; H01C10/12; H01H; H01H1/00; H01H1/02; H01H1/021; H01H1/029; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49099
Claims Analysis
Total Claims: 0
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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) | 1973-03-23 | 1973-09-22 | 1974-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-23 | 1977-09-22 | 1978-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-23 | 1981-09-22 | 1982-03-24 | $7700.00 | Window Closed / Lapsed |