Patent US2640895A successfully refreshed from Google Patents.
US2640895A
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Impulse-responsive stepping device actuated by magnetic torque
Assignee: Individual
•
Filing: 1947-10-24
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Granted: 1953-06-02
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Expires: 1967-10-24
Abstract
No abstract record available.
Inventors
- 👤 Hans P Boswau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:18
CPC Classifications
G; G08; G08B; G08B5/00; G08B5/22; G08B5/24; G08B5/30; H; H01; H01H; H01H51/00; H01H51/02; H01H51/04; H01H51/06; H01H51/08; H01H51/082
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1696368A
Cited
US1085721A
Cited
US351388A
Cited
US700839A
Cited
US913080A
Cited
US1110027A
Cited
US1462251A
Cited
FR517084A
Cited
US1479834A
Cited
US1562730A
Cited
US1802459A
Cited
FR671884A
Cited
US2090315A
Cited
US1852677A
Cited
US1911960A
Cited
US1997655A
Cited
US2156465A
Cited
US2135506A
Cited
US2209214A
Cited
US2279220A
Cited
US2289227A
Cited
US2327792A
Cited
US2371511A
Cited
GB566778A
Cited
US2496880A
Cited
US2433920A
Cited
US2475331A
Cited
US2462495A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |