US2478879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous compositions
Assignee: Wingfoot Corp
•
Filing: 1946-02-23
•
Granted: 1949-08-09
•
Expires: 1966-02-23
Abstract
No abstract record available.
Inventors
- 👤 Walter T L Ten Broeck Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:09
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06; C08J2429/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB429316A
Cited
US2224663A
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US2374078A
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US2384884A
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US2386995A
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US2376653A
Cited
US2416874A
Cited
US2405008A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-08-08 | 1953-02-07 | 1953-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-08 | 1957-02-07 | 1957-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-08 | 1961-02-07 | 1961-08-09 | $7700.00 | Window Closed / Lapsed |