US2645270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of magnetic sound tape
Assignee: Audio Devices Inc
•
Filing: 1950-12-21
•
Granted: 1953-07-14
•
Expires: 1970-12-21
Abstract
No abstract record available.
Inventors
- 👤 William C Speed
- 👤 James J Dwyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:26
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/84; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1062; Y10T156/1067; Y10T156/1075; Y10T156/1079; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24372
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US933374A
Cited
US1259834A
Cited
US2185076A
Cited
US2373500A
Cited
US2368152A
Cited
US2539611A
Cited
US2500772A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-13 | 1957-01-12 | 1957-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-13 | 1961-01-12 | 1961-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-13 | 1965-01-12 | 1965-07-14 | $7700.00 | Window Closed / Lapsed |