Patent USRE27969E successfully refreshed from Google Patents.
USRE27969E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hc-co(ch,cho)xh
Assignee: Albright and Wilson Inc
•
Filing: 1972-06-08
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Granted: 1974-04-16
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Expires: 1992-06-08
Abstract
Abstract PHOSPHORUS-CONTAINING COMPOUNDS WHICH ARE USEFUL IN THE PREPARATION OF POLYURETHANES AND WHICH ARE DERIVED FROM (1) PHOSPHORUS COMPOUNDS CONTAINING AT LEAST ONE ACTIVE FUNCTION (2) ALKYLENE OXIDES OR EPIHALOHYDRIN AND (3) DICARBOXYLIC ACID ANHYDRIDES ARE PROVIDED. AMONG THE COMPOUNDS ARE THOSE PREPARED BY REACTING A DICARBOXYLIC ACID ANHYDRIDE WITH A PHOSPHORUS ACID WHICH HAS BEEN PARTIALLY OR COMPLETELY REACTED WITH AN ALKYLENE OXIDE OR EPIHALOHYDRIN, FOLLOWED BY REACTION OF THE CARBOXYL GROUP THUS FORMED WITH ADDITIONAL ALKYLENE OXIDE OR EPIHALOHYDRIN. METHODS FOR PREPARATION OF THE COMPOUNDS ARE ALSO PROVIDED.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:22
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/50; C08G18/5075; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/09; C07F9/091; C07F9/22; C08G18/42; C08G18/46; C08G18/4684
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) | 1977-04-15 | 1977-10-15 | 1978-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-15 | 1981-10-15 | 1982-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-15 | 1985-10-15 | 1986-04-16 | $7700.00 | Window Closed / Lapsed |