US2957142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic delay line
Assignee: AT&T Inc
•
Filing: 1956-07-20
•
Granted: 1960-10-18
•
Expires: 1976-07-20
Abstract
No abstract record available.
Inventors
- 👤 Jr John E May
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:26
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/30; H03H9/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA470583A
Cited
US2592135A
Cited
US2624804A
Cited
US2703867A
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US2712638A
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US2777997A
Cited
US2839731A
Cited
US2886787A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-18 | 1964-04-18 | 1964-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-18 | 1968-04-18 | 1968-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-18 | 1972-04-18 | 1972-10-18 | $7700.00 | Window Closed / Lapsed |