Patent US2887872A successfully refreshed from Google Patents.
US2887872A
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US
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Method of measuring and compensating for deviation errors for earth's field responsive instruments
Assignee: Unisys Corp
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Filing: 1956-02-23
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Granted: 1959-05-26
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Expires: 1976-02-23
Abstract
No abstract record available.
Inventors
- 👤 Halpern William
- 👤 Marlin C Depp
- 👤 Herbert A Trenchard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:22
CPC Classifications
G; G01; G01C; G01C17/00; G01C17/38; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49075
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-25 | 1962-11-24 | 1963-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-25 | 1966-11-24 | 1967-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-25 | 1970-11-24 | 1971-05-26 | $7700.00 | Window Closed / Lapsed |