US2954928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Angle difference translator
Assignee: AT&T Inc
•
Filing: 1955-10-12
•
Granted: 1960-10-04
•
Expires: 1975-10-12
Abstract
No abstract record available.
Inventors
- 👤 James R Davey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:12
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M1/22; H03M1/24; H03M1/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2381920A
Cited
US2630552A
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US2685084A
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US2711499A
Cited
US2736889A
Cited
US2823344A
Cited
US2775727A
Cited
US2796566A
Cited
US2820937A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-04 | 1964-04-04 | 1964-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-04 | 1968-04-04 | 1968-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-04 | 1972-04-04 | 1972-10-04 | $7700.00 | Window Closed / Lapsed |