Patent US3921690A successfully refreshed from Google Patents.
Patent US1789116A successfully refreshed from Google Patents.
US1789116A
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Magnetic-clutch gear-case unit
Assignee: Keller Mechanical Eng
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Filing: 1927-11-19
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Granted: 1931-01-13
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Expires: 1947-11-19
Abstract
No abstract record available.
Inventors
- 👤 John C Shaw
- 👤 Robert D Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:11
CPC Classifications
F; F16; F16D; F16D27/00; F16D27/02; F16D27/04; F16D27/06; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19377; Y10T74/19414; Y10T74/19419; Y10T74/19423; Y10T74/19428; Y10T74/19437; Y10T74/21; Y10T74/2186; Y10T82/00; Y10T82/25; Y10T82/2531; Y10T82/2533; Y10T82/2535
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) | 1934-01-12 | 1934-07-14 | 1935-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-01-12 | 1938-07-14 | 1939-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-01-12 | 1942-07-14 | 1943-01-13 | $7700.00 | Window Closed / Lapsed |