US2852494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of polyureas
Assignee: Bayer AG
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Filing: 1956-01-26
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Granted: 1958-09-16
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Expires: 1976-01-26
Abstract
No abstract record available.
Inventors
- 👤 Lehmann Wolfgang
- 👤 Rinke Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:14
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/32; C08G18/3225; C08G18/3253; C08G18/3259; Y; Y10; Y10S; Y10S528/00; Y10S528/902
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A METHOD FOR MAKING A POLYUREA WHICH COMPRISES DECOMPOSING A DIPRIMARY ALIPHATIC DIAMINE SALT INTO THE CORRESPONDING DIAMINE BY MIXING AN ALKALI METAL HYDROXIDE WITH AN ADMIXTURE OF SAID DIAMINE SALT, WATER, AN ALIPHATIC DIISOCYANATE AND AN INERT ORGANIC SOLVENT AT A TEMPERATURE OF NOT ABOVE ABOUT +2*C., SAID DIAMINE AND SAID DIISOCYANATE BEING PRESENT IN SUBSTANTIALLY EQUAL MOLECULAR PROPORTIONS IN SAID ADMIXTURE, AND EFFECTING CHEMICAL REACTION BETWEEN THE DIAMINE AND DIISOCYANATE TO FORM A POLYMER.
Claim 2
Independent Claim
76 words
A METHOD FOR MAKING A POLYUREA WHICH COMPRISES DECOMPOSING A DIPRIMARY ALIPHATIC DIAMINE SALT INTO THE CORRESPONDING DIAMINE BY MIXING AN ALKALI METAL HYDROXIDE WITH AN ADMIXTURE OF SAID DIAMINE SALT, WATER, AN ALIPHATIC DIISOCYANATE AND AN INERT ORGANIC SOLVENT AT A TEMPERATURE OF NOT ABOVE ABOUT +2*C., SAID DIAMINE AND SAID DIISOCYANATE BEING PRESENT IN SUBSTANTIALLY EQUAL MOLECULAR PROPORTIONS IN SAID ADMIXTURE, AND EFFECTING CHEMICAL REACTION BETWEEN THE DIAMINE AND DIISOCYANATE TO FORM A POLYMER.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-15 | 1962-03-17 | 1962-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-15 | 1966-03-17 | 1966-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-15 | 1970-03-17 | 1970-09-16 | $7700.00 | Window Closed / Lapsed |