US3761522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled molecular weight aziridine polymers
Assignee: Dow Chemical Co
•
Filing: 1970-04-01
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Granted: 1973-09-25
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Expires: 1990-04-01
Abstract
Abstract Novel branched polyalkylenepolyamine compounds having a molecular weight of from about 300 to about 3,000 are prepared by reacting an aziridine with a compound having one or more primary and/or secondary amino groups. They are useful as epoxy curing agents.
Inventors
- 👤 G Ham
- 👤 J Schneider
- 👤 C Dick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:14
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/02; C08G73/0206; C07; C07C; C07C209/00; C07C209/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
11 words
The process defined by claim 1 wherein said aziridine is ethylenimine.
Claim 2
Dependent Claim
11 words
The process defined by claim 2 wherein said amine is ethylenediamine.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |