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Patent US2975852A successfully refreshed from Google Patents.
US2975852A
Expired / Lapsed
US
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Loudspeakers
Assignee: Individual
•
Filing: 1955-01-03
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Granted: 1961-03-21
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Expires: 1975-01-03
Abstract
No abstract record available.
Inventors
- 👤 Chave Donald Maynard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:50
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/30; H04R1/28; H04R1/2807; H04R1/2861; H04R1/2865
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1981347A
Cited
US1930915A
Cited
US1967223A
Cited
US2034014A
Cited
GB483745A
Cited
US2224919A
Cited
US2193398A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-20 | 1964-09-19 | 1965-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-20 | 1968-09-19 | 1969-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-20 | 1972-09-19 | 1973-03-21 | $7700.00 | Window Closed / Lapsed |