US3454147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Key locking circuit for a keyboard operated machine
Assignee: Walther Bueromaschinen GmbH
•
Filing: 1967-06-22
•
Granted: 1969-07-08
•
Expires: 1987-06-22
Abstract
No abstract record available.
Inventors
- 👤 Gunter Schrem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:09
CPC Classifications
H; H03; H03M; H03M11/00; H03M11/02; B; B41; B41J; B41J1/00; B41J1/22; B41J1/32; B41J1/40; B41J1/42; B41J7/00; B41J7/48; G; G06; G06F; G06F3/00; G06F3/01; G06F3/02; G06F3/023; G06K; G06K15/00; G06K15/02; G06K15/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US3161126A
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US3091320A
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US3088401A
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US3199446A
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US3300758A
Cited
US3234664A
Cited
US3303776A
Cited
US3232222A
Cited
US3308918A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-07 | 1973-01-06 | 1973-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-07 | 1977-01-06 | 1977-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-07 | 1981-01-06 | 1981-07-08 | $7700.00 | Window Closed / Lapsed |