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US2743628A
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Torque-converting couplings
Assignee: NAT ENGINEERING CORP
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Filing: 1951-04-06
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Granted: 1956-05-01
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Expires: 1971-04-06
Abstract
No abstract record available.
Inventors
- 👤 Frank L Scharaffa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:38
CPC Classifications
F; F16; F16D; F16D31/00; F16D31/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2371227A
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US1165381A
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US1296769A
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FR576635A
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US1752385A
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FR824606A
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US2301292A
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US2300626A
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US2399008A
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US2436669A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-01 | 1959-10-31 | 1960-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-01 | 1963-10-31 | 1964-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-01 | 1967-10-31 | 1968-05-01 | $7700.00 | Window Closed / Lapsed |