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Patent US2502837A successfully refreshed from Google Patents.
US2502837A
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US
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Position indicating system
Assignee: AT&T Inc
•
Filing: 1943-11-24
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Granted: 1950-04-04
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Expires: 1963-11-24
Abstract
No abstract record available.
Inventors
- 👤 Ferdinand S Entz
- 👤 George A Pullis
- 👤 George R Stibitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:17
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/12; G01D5/244; G01D5/249; G08; G08C; G08C19/00; G08C19/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1677000A
Cited
US2098227A
Cited
US2091533A
Cited
US2093854A
Cited
US2314719A
Cited
US2259451A
Cited
US2319412A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-03 | 1953-10-03 | 1954-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-03 | 1957-10-03 | 1958-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-03 | 1961-10-03 | 1962-04-04 | $7700.00 | Window Closed / Lapsed |