US4492788A
Expired / Lapsed
US
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Partially deacylated ultra-high molecular weight poly(N-propionylethylenimines)
Assignee: SNF SA
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Filing: 1983-01-03
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Granted: 1985-01-08
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Expires: 2003-01-03
Abstract
Abstract Ultra-high molecular weight poly(N-propionylethylenimines) are disclosed that are useful as water purification agents. The polymers of this invention include partially deacylated poly(N-propionylethylenimines) derived from poly(N-propionylethylenimines) having a weight average molecular weight, &upbar& Mw, between about 1 million and about 20 million. The polymers have a degree of deacylation that ranges from about 10% to about 90%.
Inventors
- 👤 Robert S. Cooke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:51
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/02; C08G73/0233
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
66 words
A partially deacylated polymer produced via deacylation of a polymer having a polymeric structure consisting essentially of repeat units having the structure ##STR11## wherein said partially deacylated polymer is represented by the structure ##STR12## wherein m is between about 5,000 and about 200,000; wherein n is between about 10,000 and about 200,000 and wherein d represents the degree of deacylation and is between 0.1 and 0.9.
Claim 2
Dependent Claim
66 words
A partially deacylated polymer produced via deacylation of a polymer having a polymeric structure consisting essentially of repeat units having the structure ##STR11## wherein said partially deacylated polymer is represented by the structure ##STR12## wherein m is between about 5,000 and about 200,000; wherein n is between about 10,000 and about 200,000 and wherein d represents the degree of deacylation and is between 0.1 and 0.9.
Claim 3
Dependent Claim
18 words
A partially deacylated polymer in accordance with claim 1 wherein d is between about 0.2 and about 0.8.
Claim 4
Dependent Claim
18 words
A partially deacylated polymer in accordance with claim 1 wherein m is between about 10,000 and about 200,000.
Claim 5
Dependent Claim
18 words
A partially deacylated polymer in accordance with claim 3 wherein d is between about 0.2 and about 0.8.
Claim 6
Dependent Claim
18 words
A partially deacylated polymer in accordance with claim 4 wherein m is between about 20,000 and about 140,000.
Claim 7
Dependent Claim
14 words
A partially deacylated polymer in accordance with claim 4 wherein m is about 40,000.
Claim 8
Dependent Claim
14 words
A partially deacylated polymer in accordance with claim 3 wherein d is about 0.2.
Claim 9
Dependent Claim
14 words
A partially deacylated polymer in accordance with claim 3 wherein d is about 0.5.
Claim 10
Dependent Claim
14 words
A partially deacylated polymer in accordance with claim 3 wherein d is about 0.7.
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) | 1988-01-08 | 1988-07-09 | 1989-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-08 | 1992-07-09 | 1993-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-08 | 1996-07-09 | 1997-01-08 | $7700.00 | Window Closed / Lapsed |