US3218348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sequential preparation of urethane-polyisocyanates
Assignee: Bayer Corp
•
Filing: 1961-02-23
•
Granted: 1965-11-16
•
Expires: 1981-02-23
Abstract
No abstract record available.
Inventors
- 👤 Wilbur R Mcelroy
- 👤 Simon A D Visser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:36
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; C08G18/8003; C08G18/8006; C08G18/8009; C08G18/28; C08G18/30; C08G18/32; C08G18/3203; C08G18/3206
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
IN A PROCESS FOR THE PEPARATION OF A URETHANEPOLYIOCYANATE SOLUTION BY A PROCESS WHICH COMPRISES MIXING AN ORGANIC DIISOCYANATE WITH A DIHYDRIC ALCOHOL AND A TRIHYDRIC ALCOHOL IN AN INERT ORGANIC SOLVENT FOR SAID URETHANE POLYISOCYANATE AT A TEMPERATURE FROM ABOUT 20*C. TO ABOUT 100*C., THE IMPROVEMENT WHICH COMPRISES ADDING A TRIHYDRIC ALCOHOL TO SAID ORGANIC DIISOCYANATE IN SAID SOLVENT IN A FIRST STAGE AND ADDING A DIHYDRIC ALCOHOL TO SAID ORGANIC DIISOCYANATE-TRIHYDRIC ALCOHOL REACTION PRODUCT IN A SECOND STAGE SEPARATE IN TIME FROM SAID FRIST STAGE.
Claim 2
Dependent Claim
87 words
IN A PROCESS FOR THE PEPARATION OF A URETHANEPOLYIOCYANATE SOLUTION BY A PROCESS WHICH COMPRISES MIXING AN ORGANIC DIISOCYANATE WITH A DIHYDRIC ALCOHOL AND A TRIHYDRIC ALCOHOL IN AN INERT ORGANIC SOLVENT FOR SAID URETHANE POLYISOCYANATE AT A TEMPERATURE FROM ABOUT 20*C. TO ABOUT 100*C., THE IMPROVEMENT WHICH COMPRISES ADDING A TRIHYDRIC ALCOHOL TO SAID ORGANIC DIISOCYANATE IN SAID SOLVENT IN A FIRST STAGE AND ADDING A DIHYDRIC ALCOHOL TO SAID ORGANIC DIISOCYANATE-TRIHYDRIC ALCOHOL REACTION PRODUCT IN A SECOND STAGE SEPARATE IN TIME FROM SAID FRIST STAGE.
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) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |