Patent US20030105520A1 successfully refreshed from Google Patents.
US1526337A
Expired / Lapsed
US
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Method and apparatus for measuring time intervals
Assignee: AT&T Inc
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Filing: 1919-11-11
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Granted: 1925-02-17
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Expires: 1939-11-11
Abstract
No abstract record available.
Inventors
- 👤 Ralph V L Hartley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:51
CPC Classifications
G; G04; G04F; G04F10/00; G04F10/10
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) | 1928-02-17 | 1928-08-18 | 1929-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-02-17 | 1932-08-18 | 1933-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-02-17 | 1936-08-18 | 1937-02-17 | $7700.00 | Window Closed / Lapsed |