Patent US3645924A successfully refreshed from Google Patents.
US3645924A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing flexible polyurethane foams and polyurethane coatings
Assignee: Bayer Corp
•
Filing: 1970-02-03
•
Granted: 1972-02-29
•
Expires: 1990-02-03
Abstract
Abstract ALIPHATIC ISOCYANATED BASED POLYURETHANE FOAMS AND COATINGS. THE FOAMS ARE PREPARED FROM ALIPHATIC POLYISOCYANATES, POLYOLS AND WATER IN QUASI-PREPOLYMER, FULL PREPOLYMER OR ONE-SHOT SYSTEMS USING A 2-SUBSTITUTED1,1,3,3-TETRAALKYL GUANIDINE CATALYST. THE COATINGS ARE CONVENTIONAL ISOCYANATO - TERMINATED POLYURETHANE PREPOLYMERS CURED WITH MOISTURE IN THE PRESENCE OF A 2SUBSTITUTED-1,1,3,3-TETRAALKYL GUANIDINE.
Inventors
- 👤 Adolf Wojciech Fogiel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:29
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7614; C08G18/7628; C08G18/08; C08G18/10; C08G18/16; C08G18/18; C08G18/1858; C08G18/73; C08G18/75
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |