US2021550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic control mechanism for variable speed gear boxes
Assignee: Individual
•
Filing: 1934-10-16
•
Granted: 1935-11-19
•
Expires: 1954-10-16
Abstract
No abstract record available.
Inventors
- 👤 Haycock George Wallace
- 👤 Campbell Duncan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:27
CPC Classifications
F; F16; F16H; F16H63/00; F16H63/02; Y; Y10; Y10S; Y10S74/00; Y10S74/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1938-11-18 | 1939-05-20 | 1939-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-11-18 | 1943-05-20 | 1943-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-11-18 | 1947-05-20 | 1947-11-19 | $7700.00 | Window Closed / Lapsed |