Patent US2632815A successfully refreshed from Google Patents.
US2632815A
Expired / Lapsed
US
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Means for recording electric signals
Assignee: Individual
•
Filing: 1949-07-02
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Granted: 1953-03-24
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Expires: 1969-07-02
Abstract
No abstract record available.
Inventors
- 👤 William T Crespinel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:47
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/74
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1591081A
Cited
US1883559A
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DE577480C
Cited
CH177647A
Cited
US2178641A
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FR877470A
Cited
US2378389A
Cited
US2436503A
Cited
GB618349A
Cited
US2561476A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-23 | 1956-09-22 | 1957-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-23 | 1960-09-22 | 1961-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-23 | 1964-09-22 | 1965-03-24 | $7700.00 | Window Closed / Lapsed |