US2491444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color stabilization of vinyl halide copolymers
Assignee: Wingfoot Corp
•
Filing: 1945-09-18
•
Granted: 1949-12-13
•
Expires: 1965-09-18
Abstract
No abstract record available.
Inventors
- 👤 Fred W Cox
- 👤 Jr James M Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:54
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1983949A
Cited
US2140921A
Cited
US2157997A
Cited
US2222928A
Cited
US2377752A
Cited
GB545703A
Cited
US2364227A
Cited
US2404780A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-12 | 1953-06-13 | 1953-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-12 | 1957-06-13 | 1957-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-12 | 1961-06-13 | 1961-12-13 | $7700.00 | Window Closed / Lapsed |