US3679707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Curing agent for epoxy resins
Assignee: Ajinomoto Co Inc
•
Filing: 1969-11-26
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Granted: 1972-07-25
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Expires: 1989-11-26
Abstract
Abstract Epoxides and acrylonitrile react with spiroacetal diamines of the formula TO FORM A VISCOUS LIQUID WHICH IS A GOOD HARDENER FOR EPOXY RESIN INTERMEDIATES, IN THE FORMULA R being hydrogen, methyl, or ethyl, and R'' being alkyl having one to six carbon atoms. Epoxy resins cured by means of the hardener are flexible, colorless and transparent.
Inventors
- 👤 Ippei Yoshimura
- 👤 Norihiko Fukue
- 👤 Hiroshi Sakamoto
- 👤 Hisashi Murofushi
- 👤 Takami Hiyama
- 👤 Takao Matsunaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:51
CPC Classifications
C; C07; C07D; C07D493/00; C07D493/02; C07D493/10; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/50; C08G59/5046
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
16 words
A product as set forth in claim 1, which is a viscous liquid at 20* C.
References Cited (Backward Citations)
US3128255A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |