Patent US2794975A successfully refreshed from Google Patents.
US2794975A
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Isogonal error detecting system, including two reference devices providing positional data of the same character
Assignee: Sperry Gyroscope Co Ltd
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Filing: 1954-05-26
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Granted: 1957-06-04
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Expires: 1974-05-26
Abstract
No abstract record available.
Inventors
- 👤 Sedgfield Hugh Brougham
- 👤 Greenhalgh Alan Henry
- 👤 Glenny Arthur Philip
- 👤 Dove Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:37
CPC Classifications
G; G01; G01C; G01C21/00; G01C21/10; G01C21/12; G01C21/16; G01C21/166
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US798236A
Cited
US1895240A
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US2153264A
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US2231133A
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US2432772A
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US2405568A
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US2484374A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-06-03 | 1960-12-03 | 1961-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-03 | 1964-12-03 | 1965-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-03 | 1968-12-03 | 1969-06-04 | $7700.00 | Window Closed / Lapsed |