US2946768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Condensation products of carbamic acid esters
Assignee: Bayer AG
•
Filing: 1957-08-12
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Granted: 1960-07-26
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Expires: 1977-08-12
Abstract
No abstract record available.
Inventors
- 👤 Klauke Erich
- 👤 Bayer Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:21
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; C08G18/8061; C08G18/8064; C08G12/00; C08G12/02; C08G12/04; C08G12/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
THE METHOD OF HEATING THE CONDENSATION PRODUCT OF AN N-AROMATIC SUBSTITUTED CARBAMIC ACID LOWER ALKYL ESTER AND A MEMBER SELECTED FROM THE GROUP CONSISTING OF FORMALDEHYDE AND CYCLOHEXANONE IN AN ACID MEDIUM, SAID CONDENSATION PRODUCT CONTAINING URETHANE GROUPS, TO SPLIT OFF ALCOHOL AT A TEMPERATURE WITHIN THE RANGE OF FROM ABOUT 180*C. TO ABOUT 250*C. TO FROM RESIDUAL POLYMERIC ISOCYANATES.
Claim 2
Independent Claim
60 words
THE METHOD OF HEATING THE CONDENSATION PRODUCT OF AN N-AROMATIC SUBSTITUTED CARBAMIC ACID LOWER ALKYL ESTER AND A MEMBER SELECTED FROM THE GROUP CONSISTING OF FORMALDEHYDE AND CYCLOHEXANONE IN AN ACID MEDIUM, SAID CONDENSATION PRODUCT CONTAINING URETHANE GROUPS, TO SPLIT OFF ALCOHOL AT A TEMPERATURE WITHIN THE RANGE OF FROM ABOUT 180*C. TO ABOUT 250*C. TO FROM RESIDUAL POLYMERIC ISOCYANATES.
References Cited (Backward Citations)
GB461352A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-26 | 1964-01-25 | 1964-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-26 | 1968-01-25 | 1968-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-26 | 1972-01-25 | 1972-07-26 | $7700.00 | Window Closed / Lapsed |