US2802022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing a polyurethane
Assignee: Wyeth Holdings LLC
•
Filing: 1954-12-15
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Granted: 1957-08-06
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Expires: 1974-12-15
Abstract
No abstract record available.
Inventors
- 👤 Stephen J Groszos
- 👤 Erhart K Drechsel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:29
CPC Classifications
C; C07; C07C; C07C271/00; C07C271/06; C08; C08L; C08L75/00; C08L75/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
THE METHOD OF PREPARING A POLYURETHANE WHICHH COMPRISES REACTING TOGETHER, AS SOLE REACTANTS, UREA AND AT LEAST ONE HYDROXY CARBAMATE SELECTED FROM THE CLASS CONSISTING OF PRIMARY AND SECONDARY B-HYDROXY CARBAMATES IN WHICH THE -0H IS ATTACHED DIRECTLY TO ALIPHATIC CARBON.
Claim 2
Independent Claim
41 words
THE METHOD OF PREPARING A POLYURETHANE WHICHH COMPRISES REACTING TOGETHER, AS SOLE REACTANTS, UREA AND AT LEAST ONE HYDROXY CARBAMATE SELECTED FROM THE CLASS CONSISTING OF PRIMARY AND SECONDARY B-HYDROXY CARBAMATES IN WHICH THE -0H IS ATTACHED DIRECTLY TO ALIPHATIC CARBON.
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) | 1960-08-05 | 1961-02-04 | 1961-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-05 | 1965-02-04 | 1965-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-05 | 1969-02-04 | 1969-08-06 | $7700.00 | Window Closed / Lapsed |