Patent US2804933A successfully refreshed from Google Patents.
US2804933A
Expired / Lapsed
US
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Acoustic booths
Assignee: Individual
•
Filing: 1954-11-22
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Granted: 1957-09-03
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Expires: 1974-11-22
Abstract
No abstract record available.
Inventors
- 👤 Imhof Alfred Godfrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:51
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/02; H04R1/021
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2370359A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-02 | 1961-03-04 | 1961-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-02 | 1965-03-04 | 1965-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-02 | 1969-03-04 | 1969-09-03 | $7700.00 | Window Closed / Lapsed |