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US4140680A
Expired / Lapsed
US
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2-Acrylamido-2-methylpropane sulfonic acid vinyl aminimide/copolymer
Assignee: Polaroid Corp
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Filing: 1976-12-22
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Granted: 1979-02-20
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Expires: 1996-12-22
Abstract
Abstract As a novel composition of matter, a copolymer of 2-acrylamido-2-methylpropane sulfonic acid and a vinyl aminimide.
Inventors
- 👤 Charles I. Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:04
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/10; G03G5/105; G03G5/108; C; C08; C08F; C08F220/00; C08F220/02; C08F220/52; C08F220/54; C08F220/58; C08F220/585; C08F220/60
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
25 words
A copolymer of 2-acrylamido-2-methylpropane sulfonic acid and a vinyl aminimide wherein said vinyl aminimide consists of at least about 10% by weight of said copolymer.
Claim 2
Dependent Claim
25 words
A copolymer of 2-acrylamido-2-methylpropane sulfonic acid and a vinyl aminimide wherein said vinyl aminimide consists of at least about 10% by weight of said copolymer.
Claim 3
Dependent Claim
12 words
The composition of claim 1 wherein said vinyl aminimide is trimethylamine acrylimide.
Claim 4
Dependent Claim
12 words
The composition of claim 1 wherein said vinyl aminimide is trimethylamine N-acryloyl-methylalaninimide.
Claim 5
Dependent Claim
18 words
The composition of claim 2 wherein said vinyl aminimide consists of about 20 by weight of said copolymer.
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) | 1982-02-19 | 1982-08-21 | 1983-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-19 | 1986-08-21 | 1987-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-19 | 1990-08-21 | 1991-02-20 | $7700.00 | Window Closed / Lapsed |