Patent US2639156A successfully refreshed from Google Patents.
US2639156A
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Double-twist phonograph stylus assembly
Assignee: General Electric Co
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Filing: 1949-10-29
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Granted: 1953-05-19
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Expires: 1969-10-29
Abstract
No abstract record available.
Inventors
- 👤 William W Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:35
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1160146A
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US2363497A
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US2326424A
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US2455913A
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US2426061A
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US2485432A
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US2511663A
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US2554208A
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US2554209A
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US2499196A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-18 | 1956-11-17 | 1957-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-18 | 1960-11-17 | 1961-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-18 | 1964-11-17 | 1965-05-19 | $7700.00 | Window Closed / Lapsed |