US3539540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
N-vinyl-x-alkyl-2-oxazolidinone polymers
Assignee: Dow Chemical Co
•
Filing: 1967-03-30
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Granted: 1970-11-10
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Expires: 1987-03-30
Abstract
No abstract record available.
Inventors
- 👤 Wilhelm E Walles
- 👤 William F Tousignant
- 👤 Thomas Houtman Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:46
CPC Classifications
C; C08; C08F; C08F26/00; C08F26/06; C07; C07D; C07D263/00; C07D263/02; C07D263/08; C07D263/16; C07D263/18; C07D263/20; C07D263/22; Y; Y10; Y10S; Y10S424/00; Y10S424/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2919279A
Cited
US2948656A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |