US3243767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroacoustic transducer for detection of low level acoustic signals over a broad frequency range
Assignee: Individual
•
Filing: 1962-04-30
•
Granted: 1966-03-29
•
Expires: 1982-04-30
Abstract
No abstract record available.
Inventors
- 👤 Paul M Kendig
- 👤 David C Greene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:40
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0644; B06B1/0655
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2396519A
Cited
US2638577A
Cited
US2787777A
Cited
US2760181A
Cited
US3090939A
Cited
US3043967A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-28 | 1969-09-27 | 1970-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-28 | 1973-09-27 | 1974-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-28 | 1977-09-27 | 1978-03-29 | $7700.00 | Window Closed / Lapsed |