Patent US3976604A successfully refreshed from Google Patents.
US3976604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of ethylenimine prepolymer
Assignee: United States Department of Agriculture
•
Filing: 1975-01-30
•
Granted: 1976-08-24
•
Expires: 1995-01-30
Abstract
Abstract An ethylenimine prepolymer has been prepared by mixing certain alkyl halides with ethylenimine in molar ratios of about from 44:1 to 27:1, respectively, and allowing the mixture to stand for not more than about 16 hours.
Inventors
- 👤 Earl J. Roberts
- 👤 Stanley P. Rowland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:52
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/28; C02F1/288; B; B01; B01J; B01J20/00; B01J20/22; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/22; D; D06; D06M; D06M13/00; D06M13/322; D06M13/487
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A method for producing an ethylenimine prepolymer, the method comprising: a. mixing ethylenimine with an alkyl halide selected from the group consisting of 1,2-dichloroethane, tris(2-chloroethyl)phosphoramide, bis(2-chloroethylvinyl)-phosphonate, tris(2,3-dibromopropyl)phosphate, tris(1,3-dichloroisopropyl)phosphate, B,B'-dichloroethyl ether and dichloromethane in a molar ratio of about from 44:1 to 27:1; and b. allowing the mixture to stand at 10° to 50°C for from 2 to 16 hours.
Claim 2
Independent Claim
59 words
A method for producing an ethylenimine prepolymer, the method comprising: a. mixing ethylenimine with an alkyl halide selected from the group consisting of 1,2-dichloroethane, tris(2-chloroethyl)phosphoramide, bis(2-chloroethylvinyl)-phosphonate, tris(2,3-dibromopropyl)phosphate, tris(1,3-dichloroisopropyl)phosphate, B,B'-dichloroethyl ether and dichloromethane in a molar ratio of about from 44:1 to 27:1; and b. allowing the mixture to stand at 10° to 50°C for from 2 to 16 hours.
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) | 1979-08-24 | 1980-02-23 | 1980-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-24 | 1984-02-23 | 1984-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-24 | 1988-02-23 | 1988-08-24 | $7700.00 | Window Closed / Lapsed |