US1812871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable speed controller mechanism
Assignee: Brown and Sharpe Manufacturing Co
•
Filing: 1928-01-20
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Granted: 1931-07-07
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Expires: 1948-01-20
Abstract
No abstract record available.
Inventors
- 👤 Benjamin P Graves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:47
CPC Classifications
G; G05; G05G; G05G9/00; G05G9/08; G05G2700/00; G05G2700/22; G05G2700/26; G05G2700/30; Y; Y10; Y10T; Y10T409/00; Y10T409/30; Y10T409/304536; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19242; Y10T74/20; Y10T74/20576; Y10T74/20636; Y10T74/20732; Y10T74/20762
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) | 1934-07-06 | 1935-01-05 | 1935-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-07-06 | 1939-01-05 | 1939-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-07-06 | 1943-01-05 | 1943-07-07 | $7700.00 | Window Closed / Lapsed |