US4255548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ethylene-vinylamine copolymers
Assignee: Air Products and Chemicals Inc
•
Filing: 1980-01-07
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Granted: 1981-03-10
•
Expires: 2000-01-07
Abstract
Abstract Copolymers of ethylene and vinylamine are disclosed as are methods for their production. The disclosed copolymers find application primarily as flocculants.
Inventors
- 👤 Robert E. Wingard, Jr.
- 👤 Eric R. Larson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:29
CPC Classifications
C; C08; C08F; C08F210/00; C08F210/02; C02; C02F; C02F1/00; C02F1/52; C02F1/54; Y; Y10; Y10S; Y10S524/00; Y10S524/922
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
11 words
A random copolymer consisting essentially of ethylene and vinylamine repeating units.
Claim 2
Dependent Claim
11 words
A random copolymer consisting essentially of ethylene and vinylamine repeating units.
Claim 3
Dependent Claim
19 words
The copolymer of claim 1 wherein the mole ratio of ethylene units to vinylamine units is 1:1 to 10:1.
Claim 4
Dependent Claim
19 words
The copolymer of claim 2 having an average molecular weight of from 1×10 3 daltons to 1×10 8 daltons.
References Cited (Backward Citations)
US4018826A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-09 | 1984-09-08 | 1985-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-09 | 1988-09-08 | 1989-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-09 | 1992-09-08 | 1993-03-10 | $7700.00 | Window Closed / Lapsed |