Patent US2447384A successfully refreshed from Google Patents.
US2447384A
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US
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Torque-transmitting apparatus
Assignee: Polaroid Corp
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Filing: 1944-02-25
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Granted: 1948-08-17
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Expires: 1964-02-25
Abstract
No abstract record available.
Inventors
- 👤 Otto E Wolff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:52
CPC Classifications
F; F16; F16D; F16D43/00; F16D43/02; F16D43/20; F16D43/21; F16D43/211
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US122818A
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US2288859A
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GB191120650A
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DE534161C
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CH143096A
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GB372406A
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US2179837A
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US2263599A
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US2251445A
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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) | 1951-08-17 | 1952-02-16 | 1952-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-17 | 1956-02-16 | 1956-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-17 | 1960-02-16 | 1960-08-17 | $7700.00 | Window Closed / Lapsed |