Patent US3243525A successfully refreshed from Google Patents.
US3243525A
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US
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Hearing intensifying and directing apparatus
Assignee: Individual
•
Filing: 1962-11-13
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Granted: 1966-03-29
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Expires: 1982-11-13
Abstract
No abstract record available.
Inventors
- 👤 Eaton Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:25
CPC Classifications
H; H04; H04S; H04S1/00; Y; Y10; Y10S; Y10S367/00; Y10S367/91
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3124760A
Cited
US1907723A
Cited
US1973673A
Cited
US2166991A
Cited
FR862452A
Cited
FR971273A
Cited
US2930858A
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 |