US2730518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Beryllium hydroxide as catalyst in reacting polyesters with diisocyanates
Assignee: Imperial Chemical Industries Ltd
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Filing: 1954-07-23
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Granted: 1956-01-10
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Expires: 1974-07-23
Abstract
No abstract record available.
Inventors
- 👤 Birley Arthur William
- 👤 Crawford John William Croom
- 👤 Jukes Alan William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:02
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/4236; C08G18/4238; C08L; C08L75/00; C08L75/04; C08L75/06; Y; Y10; Y10S; Y10S528/00; Y10S528/903; Y10S528/906
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
94 words
IN A PROCESS FOR THE PRODUCTION OF CURED RUBBERLIKE MATERIAL FROM A DIISOCYANATE-MODIFIED POLYESTER OBTAINED BY REACTING UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS (1) A POLYESTER HAVING TERMINAL GROUPS THAT ARE MAINLY HYDROXYL GROUPS AND AN AVERAGE MOLECULAR WEIGHT OF AT LEAST 1,000, SAID POLYESTER BEING OBTAINED BY THE REACTION OF AT LEAST ONE GLYCOL AND AT LEAST ONE DICARBOXYLIC ACID AND (2) A DIISOCYANATE PRESENT IN EXCESS OF SAID POLYESTER ON A MOL BASIS, THE STEP COMPRISING HEATING SAID DIISOCYANATE-MODIFIED POLYESTER AT A CURING TEMPERATURE IN THE PRESENCE OF A CATALYTIC AMOUNT OF BERYLLIUM HYDROXIDE.
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) | 1959-01-09 | 1959-07-11 | 1960-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-09 | 1963-07-11 | 1964-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-09 | 1967-07-11 | 1968-01-10 | $7700.00 | Window Closed / Lapsed |