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Patent US2406870A successfully refreshed from Google Patents.
US2406870A
Expired / Lapsed
US
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Apparatus for responding to magnetic fields
Assignee: Gulf Research and Development Co
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Filing: 1941-07-21
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Granted: 1946-09-03
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Expires: 1961-07-21
Abstract
No abstract record available.
Inventors
- 👤 Victor V Vacquier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:33
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/02; G01R33/04
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) | 1949-09-02 | 1950-03-04 | 1950-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-09-02 | 1954-03-04 | 1954-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-09-02 | 1958-03-04 | 1958-09-03 | $7700.00 | Window Closed / Lapsed |