Patent US3032138A successfully refreshed from Google Patents.
US3032138A
Expired / Lapsed
US
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Acoustical devices
Assignee: Hawley Products Co
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Filing: 1957-11-25
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Granted: 1962-05-01
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Expires: 1977-11-25
Abstract
No abstract record available.
Inventors
- 👤 Jr William W Haerther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:22
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/02; H04R7/12; H04R7/14; H04R7/16; H04R7/18; H04R7/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB249062A
Cited
US1930328A
Cited
US2107757A
Cited
US2439665A
Cited
US2685935A
Cited
DE1004232B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-30 | 1965-10-30 | 1966-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-30 | 1969-10-30 | 1970-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-30 | 1973-10-30 | 1974-05-01 | $7700.00 | Window Closed / Lapsed |