Patent US3785327A successfully refreshed from Google Patents.
Patent US2458639A successfully refreshed from Google Patents.
US2458639A
Expired / Lapsed
US
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Vinyl copolymer and process for its production
Assignee: Carbide and Carbon Chemicals Corp
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Filing: 1944-10-13
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Granted: 1949-01-11
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Expires: 1964-10-13
Abstract
No abstract record available.
Inventors
- 👤 Richard W Quarles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:43
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/12; C08F214/00; C08F214/02; C08F214/04; C08F214/06; C08F2810/00; C08F2810/50; Y; Y10; Y10S; Y10S526/00; Y10S526/912
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-01-11 | 1952-07-12 | 1953-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-01-11 | 1956-07-12 | 1957-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-01-11 | 1960-07-12 | 1961-01-11 | $7700.00 | Window Closed / Lapsed |