Patent US3826769A successfully refreshed from Google Patents.
US3826769A
Expired / Lapsed
US
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Self-emulsified polyurethanes prepared by direct sulfonation of isocyanate
Assignee: 3M Co
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Filing: 1972-08-14
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Granted: 1974-07-30
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Expires: 1992-08-14
Abstract
Abstract THE DISCLOSED POLYMERS ARE USEFUL IN SELF-EMULSIFIED POLYURETHANE (INCLUDING POLYURETHANE--POLYUREA) LATICES FORMED BY REACTING AN AROMATIC ISOCYANATE-TERMINATED POLYURETHANE POLYMER WITH A STRONG SULFONATING AGENT AND CHAIN EXTENDING THE PREPOLYMER WITH WATER, THE CHAIN EXTENSION BEING PREFERABLY SUBSEQUENT TO OR SIMULTANEOUS WITH A NEUTRALIZATION STEP.
Inventors
- 👤 R Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:42
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/775; C08G18/08; C08G18/0804; C08G18/0819; C08G18/0828; C08G18/10; C08G2170/00; C08G2170/80
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) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |