Patent US3033157A successfully refreshed from Google Patents.
US3033157A
Expired / Lapsed
US
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Apparatus for producing sound waves
Assignee: Individual
•
Filing: 1955-10-20
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Granted: 1962-05-08
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Expires: 1975-10-20
Abstract
No abstract record available.
Inventors
- 👤 Harold E Sawyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:33
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1473478A
Cited
US1962154A
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FR704486A
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US2089983A
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FR788318A
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US2248459A
Cited
US2323015A
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US2348189A
Cited
US2605413A
Cited
US2438925A
Cited
US2545101A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-05-07 | 1965-11-06 | 1966-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-07 | 1969-11-06 | 1970-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-07 | 1973-11-06 | 1974-05-08 | $7700.00 | Window Closed / Lapsed |