US2872640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Positioning device
Assignee: AT&T Inc
•
Filing: 1957-10-14
•
Granted: 1959-02-03
•
Expires: 1977-10-14
Abstract
No abstract record available.
Inventors
- 👤 Walter T Eppler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:28
CPC Classifications
G; G01; G01B; G01B7/00; G01B7/02; G01B7/06; G01B7/08; G01B7/085; G01B5/00; G01B5/08; G01B5/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1623436A
Cited
US2146442A
Cited
US2177528A
Cited
US2332182A
Cited
US2514847A
Cited
US2743607A
Cited
US2834207A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-02 | 1962-08-04 | 1963-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-02 | 1966-08-04 | 1967-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-02 | 1970-08-04 | 1971-02-03 | $7700.00 | Window Closed / Lapsed |