US3562216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of manufacture of polyether ureas and thioureas prepared by reacting hemiformals of polyvalent alcohols with urea or thiourea
Assignee: Huels AG
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Filing: 1965-07-13
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Granted: 1971-02-09
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Expires: 1985-07-13
Abstract
Abstract POLYETHER UREA AND THIOUREAU CONDENSATION PRODUCTS PRODUCED BY THE ACTION OF HEMIFORMALS OF POLYVALENT ALCOHOLS, POSSIBLY IN MIXTURES WITH HEMIFORMALS OF MONOVALENT ALCOHOLS, WITH UREA AND/OR THIORUEA, AND IN THE PRESENCE OF ACID OR BASIC CATALYST.
Inventors
- 👤 Hans Von Portatius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:11
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/40; C08G12/42; C08G12/421; C08G12/422; C08L; C08L75/00; C08L75/02
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |