Patent US3557056A successfully refreshed from Google Patents.
US3557056A
Expired / Lapsed
US
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Curing of epoxy resins with certain aminoamides
Assignee: General Mills Inc
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Filing: 1969-01-21
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Granted: 1971-01-19
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Expires: 1989-01-21
Abstract
Abstract WHERE R IS N IS 1 OR 2, Z IS OR (CH2)X-R'', X IS 1,2 OR 3, AND R'' IS B-STAGE RESINS ARE PREPARED AS WELL AS FULLY CURED PRODUCTS (C-STAGE). NH2-CO-CH2-CH2-NH- OR 4-(NH2-CO-CH2-CH2-)PIPERAZINO N IS 1 TO 2, Z IS NH2-CO-CH2-CH2- WHERE R IS PHENYLENE OR CYCLOHEXYLENE AND 1-(NH2-CO-CH2-CH2-),4-Z-PIPERAZINE NH2-CO-CH2-CH2-NH-(CH2)N-R-(CH2)N-NH-CH2-CH2-CO-NH2 AND EPOXY RESINS ARE CURED WITH COMPOUNDS OF THE FORMULAE
Inventors
- 👤 Dwight E Peerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:59
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/04; C07D295/12; C07D295/125; C07D295/13; C07D295/14; C07D295/145; C07D295/15; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/50; C08G59/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |