Patent US3376236A successfully refreshed from Google Patents.
US3376236A
Expired / Lapsed
US
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Vinyl alkanoate-alkyl maleamate copolymers as surfactants for polyurethanes
Assignee: Pharmacia and Upjohn Co
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Filing: 1964-12-30
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Granted: 1968-04-02
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Expires: 1984-12-30
Abstract
No abstract record available.
Inventors
- 👤 William E Erner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:41
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08F; C08F22/00; C08F22/36; C08J2375/00; C08J2375/04; C08J2457/00
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) | 1971-04-02 | 1971-10-02 | 1972-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-02 | 1975-10-02 | 1976-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-02 | 1979-10-02 | 1980-04-02 | $7700.00 | Window Closed / Lapsed |