Patent US2742453A successfully refreshed from Google Patents.
US2742453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyhydroxypolyalkylenepolyureas
Assignee: Rohm and Haas Co
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Filing: 1952-07-22
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Granted: 1956-04-17
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Expires: 1972-07-22
Abstract
No abstract record available.
Inventors
- 👤 Robert W Auten
- 👤 Robert S Yost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:32
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/02; C08G73/0206
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
A PROCESS FOR PREPARING POLYHYDROXYPOLYALKYLENEPOLYUREAS WHICH COMPRISES REACTING BETWEEN ABOUT 0* AND 100* C. IN THE PRESENCE OF WATER EPICHLOROHYDRIN AND AN ALKYLENE POLYAMINE HAVING TWO TO THREE CARBON ATOMS IN THE ALKYLENE PORTION THEREOF IN A MOLE RATIO FROM 1:1 TO 1.4:1 UNTIL AN AQUEOUS SOLUTION OF THE RESULTING POLYHYDROXYPOLYALKYLENEPOLYAMINE AT A CONCENTRATION OF ABOUT 46% HAS A VISCOSITY FROM J TO Z7 AT 25* C. IN THE GARDNER-HOLDT SCALE AND REACTING SAID POLYHYDROXYPOLYALKYLENEPOLYAMINE WITH UREA BETWEEN 100* AND 200* C. WITH EVOLUTION OF AMMONIA IN A RATIO FROM 0.5:1 TO 1.8:1 OF UREA PER -NH-GROUP OF SAID POLYHYDROXYPOLYALKYLENEPOLYAMINE UNTIL AN AQUEOUS 45% SOLUTION OF THE RESULTING POLYHYDROXYPOLYALKYLENEPOLYUREA HAS A VISCOSITY FROM B TO Z3 AT 25* C. ON THE GARDNER-HOLDT SCALE.
Claim 2
Dependent Claim
123 words
A PROCESS FOR PREPARING POLYHYDROXYPOLYALKYLENEPOLYUREAS WHICH COMPRISES REACTING BETWEEN ABOUT 0* AND 100* C. IN THE PRESENCE OF WATER EPICHLOROHYDRIN AND AN ALKYLENE POLYAMINE HAVING TWO TO THREE CARBON ATOMS IN THE ALKYLENE PORTION THEREOF IN A MOLE RATIO FROM 1:1 TO 1.4:1 UNTIL AN AQUEOUS SOLUTION OF THE RESULTING POLYHYDROXYPOLYALKYLENEPOLYAMINE AT A CONCENTRATION OF ABOUT 46% HAS A VISCOSITY FROM J TO Z7 AT 25* C. IN THE GARDNER-HOLDT SCALE AND REACTING SAID POLYHYDROXYPOLYALKYLENEPOLYAMINE WITH UREA BETWEEN 100* AND 200* C. WITH EVOLUTION OF AMMONIA IN A RATIO FROM 0.5:1 TO 1.8:1 OF UREA PER -NH-GROUP OF SAID POLYHYDROXYPOLYALKYLENEPOLYAMINE UNTIL AN AQUEOUS 45% SOLUTION OF THE RESULTING POLYHYDROXYPOLYALKYLENEPOLYUREA HAS A VISCOSITY FROM B TO Z3 AT 25* C. ON THE GARDNER-HOLDT SCALE.
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) | 1959-04-17 | 1959-10-17 | 1960-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-17 | 1963-10-17 | 1964-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-17 | 1967-10-17 | 1968-04-17 | $7700.00 | Window Closed / Lapsed |