US2939401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled governors
Assignee: Engineering Res & Applic Ltd
•
Filing: 1957-07-03
•
Granted: 1960-06-07
•
Expires: 1977-07-03
Abstract
No abstract record available.
Inventors
- 👤 Hodkin David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:06
CPC Classifications
G; G05; G05D; G05D13/00; G05D13/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1142726A
Cited
GB187684A
Cited
GB217559A
Cited
US2015200A
Cited
US2321934A
Cited
US2419924A
Cited
US2673604A
Cited
US2746240A
Cited
US2690712A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-07 | 1963-12-07 | 1964-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-07 | 1967-12-07 | 1968-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-07 | 1971-12-07 | 1972-06-07 | $7700.00 | Window Closed / Lapsed |