Patent US3528939A successfully refreshed from Google Patents.
US3528939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water dispersible half esters of styrenemaleic anhydride copolymers with n-hydroxy alkyl amides of unsaturated fat acids
Assignee: Sinclair Research Inc
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Filing: 1968-01-22
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Granted: 1970-09-15
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Expires: 1988-01-22
Abstract
No abstract record available.
Inventors
- 👤 Richard J Pratt
- 👤 Roger H Jansma
- 👤 Robert J Conboy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:55
CPC Classifications
C; C09; C09D; C09D135/00; C08; C08F; C08F8/00; C08F8/14; C08F8/30; C08F8/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CH256766A
Cited
CH256764A
Cited
GB615665A
Cited
US3293201A
Cited
US3369983A
Cited
US3396135A
Cited
US3395131A
Cited
US3446783A
Cited
US3425977A
Cited
US3428588A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-14 | 1974-03-16 | 1974-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-14 | 1978-03-16 | 1978-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-14 | 1982-03-16 | 1982-09-15 | $7700.00 | Window Closed / Lapsed |