US2472770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resistance apparatus for converting mechanical movement into electrical pulses
Assignee: GTE Sylvania Inc
•
Filing: 1945-11-20
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Granted: 1949-06-07
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Expires: 1965-11-20
Abstract
No abstract record available.
Inventors
- 👤 Jr Leo L Helterline
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:21
CPC Classifications
H; H04; H04R; H04R21/00; H04R21/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1410793A
Cited
US1570297A
Cited
US1819083A
Cited
US1757547A
Cited
US2402839A
Cited
US2415841A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-06 | 1952-12-06 | 1953-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-06 | 1956-12-06 | 1957-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-06 | 1960-12-06 | 1961-06-07 | $7700.00 | Window Closed / Lapsed |