US2853146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmitter with vibratile air coupling
Assignee: Individual
•
Filing: 1955-02-07
•
Granted: 1958-09-23
•
Expires: 1975-02-07
Abstract
No abstract record available.
Inventors
- 👤 George A Coates
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:32
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US921465A
Cited
US1477553A
Cited
US1672796A
Cited
US1934932A
Cited
US2171940A
Cited
US2224931A
Cited
US2765043A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-22 | 1962-03-24 | 1962-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-22 | 1966-03-24 | 1966-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-22 | 1970-03-24 | 1970-09-23 | $7700.00 | Window Closed / Lapsed |