Patent US2461508A successfully refreshed from Google Patents.
US2461508A
Expired / Lapsed
US
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Friction element comprising discrete particles of insoluble furfuraldehyde ketone resin
Assignee: Harvel Research Corp
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Filing: 1948-02-12
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Granted: 1949-02-15
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Expires: 1968-02-12
Abstract
No abstract record available.
Inventors
- 👤 Mortimer T Harvey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:17
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/18; C08G2/20; C08G2/30; C08L; C08L61/00; C08L61/02; F; F16; F16D; F16D69/00; F16D69/02; F16D69/021; F16D69/022
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2164326A
Cited
US2383790A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-02-15 | 1952-08-16 | 1953-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-02-15 | 1956-08-16 | 1957-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-02-15 | 1960-08-16 | 1961-02-15 | $7700.00 | Window Closed / Lapsed |