US3488602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic surface waveguides
Assignee: AT&T Inc
•
Filing: 1968-08-09
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Granted: 1970-01-06
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Expires: 1988-08-09
Abstract
No abstract record available.
Inventors
- 👤 Harold Seidel
- 👤 Donald L White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:14
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/36; G10K11/18; G10K11/24; H; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/06; H02M7/10; H03; H03H; H03H9/00; H03H9/02; H03H9/02535; H03H9/02818; H03H9/02881; H03H9/30; H03H9/36; H03H9/46; H03H7/00; H03H7/42
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) | 1973-01-05 | 1973-07-07 | 1974-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-05 | 1977-07-07 | 1978-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-05 | 1981-07-07 | 1982-01-06 | $7700.00 | Window Closed / Lapsed |