US2971271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: WILLIAM DOUGLAS MCADAMS Inc
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Filing: 1956-10-18
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Granted: 1961-02-14
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Expires: 1976-10-18
Abstract
No abstract record available.
Inventors
- 👤 Allan B Goldenthal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:48
CPC Classifications
G; G09; G09B; G09B23/00; G09B23/28; G09B23/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR642510A
Cited
US1873748A
Cited
FR784745A
Cited
FR819517A
Cited
US2158906A
Cited
US2472114A
Cited
US2588545A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-14 | 1964-08-15 | 1965-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-14 | 1968-08-15 | 1969-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-14 | 1972-08-15 | 1973-02-14 | $7700.00 | Window Closed / Lapsed |