Patent US3001973A successfully refreshed from Google Patents.
US3001973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of cross-linked plastics
Assignee: Bayer AG
•
Filing: 1954-05-19
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Granted: 1961-09-26
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Expires: 1974-05-19
Abstract
No abstract record available.
Inventors
- 👤 Ursula B Piepenbrink
- 👤 Windemuth Erwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:25
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/22; C08G18/222; C08G18/10; C08G18/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A METHOD FOR THE PREPARATION OF A NOVEL CROSSLINKED PLASTIC WHICH COMPRISES MIXING AS THE SOLE REACTIVE INGREDIENTS: (1) AN ORGANIC COMPOUND CARRYING ALCOHOLIC HYDROXYL GROUPS, SAID ORGANIC COMPOUND BEING SELECTED FROM THE GROUP CONSISTING OF A HYDROXYL-TERMINATED POLYESTER PREPARED BY THE ESTERIFICATION OF A POLYCARBOXYLIC ACID WITH A POLYHYDRIC ALCOHOL, SAID POLYESTER HAVING A MAXIMUM ACID NUMBER OF ABOUT 1.2, AND A POLY-(ALKYLENE ETHER) GLYCOL WITH (2) AN ALIPHATIC DIISOCYANATE, THE RATIO OF NCO GROUPS TO ACTIVE HYDROGEN ATOMS BEING 1.4-2 NCO GROUPS PER ONE ACTIVE HYDROGEN ATOM, EFFECTING CHEMICAL REACTION TO FORM AN ADDUCT HAVING TERMINAL NCO GROUPS, AND THEN CATALYTICALLY POLYMERIZING THE NCO GROUPS OF THE ADDUCT WITH ONE ANOTHER UNDER ANHYDROUS CONDITION EMPLOYING FERRIC ACETYL ACETONATE AS CATALYST, ALL OF SAID POLYISOCYANATE BEING ADDED TO THE FIRST REACTANT IN ONE STAGE.
Claim 2
Independent Claim
135 words
A METHOD FOR THE PREPARATION OF A NOVEL CROSSLINKED PLASTIC WHICH COMPRISES MIXING AS THE SOLE REACTIVE INGREDIENTS: (1) AN ORGANIC COMPOUND CARRYING ALCOHOLIC HYDROXYL GROUPS, SAID ORGANIC COMPOUND BEING SELECTED FROM THE GROUP CONSISTING OF A HYDROXYL-TERMINATED POLYESTER PREPARED BY THE ESTERIFICATION OF A POLYCARBOXYLIC ACID WITH A POLYHYDRIC ALCOHOL, SAID POLYESTER HAVING A MAXIMUM ACID NUMBER OF ABOUT 1.2, AND A POLY-(ALKYLENE ETHER) GLYCOL WITH (2) AN ALIPHATIC DIISOCYANATE, THE RATIO OF NCO GROUPS TO ACTIVE HYDROGEN ATOMS BEING 1.4-2 NCO GROUPS PER ONE ACTIVE HYDROGEN ATOM, EFFECTING CHEMICAL REACTION TO FORM AN ADDUCT HAVING TERMINAL NCO GROUPS, AND THEN CATALYTICALLY POLYMERIZING THE NCO GROUPS OF THE ADDUCT WITH ONE ANOTHER UNDER ANHYDROUS CONDITION EMPLOYING FERRIC ACETYL ACETONATE AS CATALYST, ALL OF SAID POLYISOCYANATE BEING ADDED TO THE FIRST REACTANT IN ONE STAGE.
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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) | 1964-09-25 | 1965-03-27 | 1965-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-25 | 1969-03-27 | 1969-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-25 | 1973-03-27 | 1973-09-26 | $7700.00 | Window Closed / Lapsed |