US2563647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for making continuous sound records
Assignee: Individual
•
Filing: 1946-04-03
•
Granted: 1951-08-07
•
Expires: 1966-04-03
Abstract
No abstract record available.
Inventors
- 👤 Jr John Hays Hammond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:13
CPC Classifications
G; G10; G10H; G10H3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB190812820A
Cited
US1555281A
Cited
US1665331A
Cited
US1967239A
Cited
US2002151A
Cited
US2144844A
Cited
US2255559A
Cited
US2209664A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-06 | 1955-02-05 | 1955-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-06 | 1959-02-05 | 1959-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-06 | 1963-02-05 | 1963-08-07 | $7700.00 | Window Closed / Lapsed |