US2715192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transducer
Assignee: American District Telegraph Co
•
Filing: 1953-12-03
•
Granted: 1955-08-09
•
Expires: 1973-12-03
Abstract
No abstract record available.
Inventors
- 👤 Lawrence H Kelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:05
CPC Classifications
H; H04; H04R; H04R15/00; H04R15/02; B; B06; B06B; B06B1/00; B06B1/02; B06B1/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1982341A
Cited
US2116522A
Cited
DE614498C
Cited
US2478207A
Cited
US2539535A
Cited
US2498990A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-08-08 | 1959-02-07 | 1959-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-08-08 | 1963-02-07 | 1963-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-08-08 | 1967-02-07 | 1967-08-09 | $7700.00 | Window Closed / Lapsed |