Patent US2547464A successfully refreshed from Google Patents.
US2547464A
Expired / Lapsed
US
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Sound recording and reproducing apparatus
Assignee: Individual
•
Filing: 1950-03-03
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Granted: 1951-04-03
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Expires: 1970-03-03
Abstract
No abstract record available.
Inventors
- 👤 Frederick G Hehr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:43
CPC Classifications
H; H04; H04S; H04S3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1711529A
Cited
US1674683A
Cited
US1847860A
Cited
GB468068A
Cited
FR830073A
Cited
US2213246A
Cited
US2272821A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-02 | 1954-10-02 | 1955-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-02 | 1958-10-02 | 1959-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-02 | 1962-10-02 | 1963-04-03 | $7700.00 | Window Closed / Lapsed |