US2514578A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound recording and reproduction system
Assignee: Heller
•
Filing: 1948-03-25
•
Granted: 1950-07-11
•
Expires: 1968-03-25
Abstract
No abstract record available.
Inventors
- 👤 Herman S Heller
- 👤 Willard E Stofer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:42
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/10; G11B27/19; G11B27/28; G11B27/32; G11B15/00; G11B15/02; G11B15/12; G11B15/18; G11B15/44; G11B2220/00; G11B2220/90; G11B2220/95
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB297327A
Cited
US2038976A
Cited
US2031605A
Cited
US2172779A
Cited
US2110090A
Cited
US2225323A
Cited
US2248293A
Cited
US2422143A
Cited
US2396409A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-10 | 1954-01-09 | 1954-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-10 | 1958-01-09 | 1958-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-10 | 1962-01-09 | 1962-07-11 | $7700.00 | Window Closed / Lapsed |