US2978670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compressional wave translating device
Assignee: AT&T Inc
•
Filing: 1943-02-22
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Granted: 1961-04-04
•
Expires: 1963-02-22
Abstract
No abstract record available.
Inventors
- 👤 Jr Robert Lee Peek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:24
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2059107A
Cited
US1966446A
Cited
FR770430A
Cited
GB422259A
Cited
US2153571A
Cited
US2170206A
Cited
FR832891A
Cited
US2249835A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-03 | 1964-10-03 | 1965-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-03 | 1968-10-03 | 1969-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-03 | 1972-10-03 | 1973-04-04 | $7700.00 | Window Closed / Lapsed |