US2770976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable speed drive mechanism
Assignee: GAF Chemicals Corp
•
Filing: 1955-08-29
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Granted: 1956-11-20
•
Expires: 1975-08-29
Abstract
No abstract record available.
Inventors
- 👤 Frederick H Frantz
- 👤 Werner O Schink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:38
CPC Classifications
F; F16; F16H; F16H15/00; F16H15/02; F16H15/04; F16H15/06; F16H15/08; F16H15/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1397296A
Cited
US2665591A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-20 | 1960-05-21 | 1960-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-20 | 1964-05-21 | 1964-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-20 | 1968-05-21 | 1968-11-20 | $7700.00 | Window Closed / Lapsed |