US1955922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic change-over system for hydraulic apparatus
Assignee: American Engineering Co Ltd
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Filing: 1931-03-20
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Granted: 1934-04-24
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Expires: 1951-03-20
Abstract
No abstract record available.
Inventors
- 👤 Robert C Lamond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:41
CPC Classifications
B; B63; B63H; B63H25/00; B63H25/06; B63H25/08; B63H25/14; B63H25/26; B63H25/28
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) | 1937-04-23 | 1937-10-23 | 1938-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-04-23 | 1941-10-23 | 1942-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-04-23 | 1945-10-23 | 1946-04-24 | $7700.00 | Window Closed / Lapsed |