Patent US2500903A successfully refreshed from Google Patents.
US2500903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic wire sound recording and reproducing apparatus
Assignee: WIRECORDER Corp
•
Filing: 1945-08-02
•
Granted: 1950-03-14
•
Expires: 1965-08-02
Abstract
No abstract record available.
Inventors
- 👤 Mortimer A Neff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:22
CPC Classifications
G; G11; G11B; G11B25/00; G11B25/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1665784A
Cited
US1844224A
Cited
US1883560A
Cited
US1886856A
Cited
US2051036A
Cited
US2091756A
Cited
US2248790A
Cited
US2349018A
Cited
US2408320A
Cited
US2351005A
Cited
US2412318A
Cited
US2369017A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |