Patent US1825855A successfully refreshed from Google Patents.
US1825855A
Expired / Lapsed
US
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System and apparatus employing the "hall effect"
Assignee: INVEX Corp
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Filing: 1929-01-14
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Granted: 1931-10-06
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Expires: 1949-01-14
Abstract
No abstract record available.
Inventors
- 👤 Craig Palmer Hunt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:38
CPC Classifications
H; H03; H03F; H03F15/00; G; G01; G01D; G01D5/00; G01D5/12; G01D5/14; G01D5/18; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/481; G01P3/488; G01R; G01R21/00; G01R21/08; G01R33/00; G01R33/02; G01R33/06; G01R33/07; H03B; H03B15/00; H03F9/00; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H10; H10N; H10N52/00
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) | 1934-10-05 | 1935-04-06 | 1935-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-10-05 | 1939-04-06 | 1939-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-10-05 | 1943-04-06 | 1943-10-06 | $7700.00 | Window Closed / Lapsed |