US3558562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for forming watersoluble polyamides
Assignee: WR Grace and Co
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Filing: 1967-11-21
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Granted: 1971-01-26
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Expires: 1987-11-21
Abstract
Abstract A SYNTHETIC LINEAR WATER-SOLUBLE POLYAMIDE IS FORMED BY THE REACTION OF EQUIMOLAR PROPORTIONS OF IMINODIACETONITRILE ANDFORMALDEHYDE IN THE PRESENCE OF AN ACID AND WATER TO FORM A POLYAMIDE WHICH IS WATERSOLUBLE IN THE BASE FORM OR THE ACID SALT FORM. THE POLYAMIDE CAN BE REACTED WITH ACRYLONITRILE, ACRYLAMIDE OR ACRYLIC ACID TO PUT A SUBSTITUENT ON THE SECONDARY AMINE NITROGEN. THE NITRILE OR THE AMIDE MAY BE HYDROLYZED TO THE ACID WHICH READILY FORMS SALTS. ALL PRODUCTS ARE WATER SOLUBLE.
Inventors
- 👤 David E Kramm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:51
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/38
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |