US2620516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic polymeric product and process for producing the same
Assignee: Bayer AG
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Filing: 1949-07-02
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Granted: 1952-12-09
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Expires: 1969-07-02
Abstract
No abstract record available.
Inventors
- 👤 Muller Karl Erwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:18
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/4236; C08G18/4238; C08G18/08; C08G18/10; C08G2380/00; C08G2410/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
124 words
A PROCESS WHICH COMPRISES REACTING AN ANHYDROUS, SUBSTANTIALLY LINEAR, DICARBOXYLIC ACID-DIHYDRIC ALCOHOL-POLY CONDENSATION PRODUCT HAVING A TERMINAL GROUPS PREDOMINANTLY ALCOHOLIC HYDROXYL GROUP WITH A DIISOCYANATE, IN AN AMOUNT OF FROM ABOUT 20 TO ABOUT 100 PER CENT IN EXCESS OF THE AMOUNT EQUIVALENT TO THE HYDROXYL GROUPS IN SAID POLYESTER, ADDING A BIFUNCTIONAL AMINO COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE DIAMINES AND AMINOALCOHOLS IN AN AMOUNT CORRESPONDING TO NO MORE THAN THAT EQUIVALENT TO THE FREE ISOCYANATE GROUPS IN THE MODIFIED POLYESTER, SAID DIISOCYANATE AND SAID AMINO COMPOUND BEING SO SELECTED THAT REACTION BETWEEN THEM IN BOILING METHYLENECHLORIDE IN SEMIMOLAR CONCENTRATION CAUSES NO TURBIDITY INSIDE 25 SECONDS, CASTING THE LIQUID REACTION MIXTURE INTO A MOLD AND HEATING THE CAST MIXTURE THUS OBTAINED.
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) | 1955-12-09 | 1956-06-09 | 1956-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-09 | 1960-06-09 | 1960-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-09 | 1964-06-09 | 1964-12-09 | $7700.00 | Window Closed / Lapsed |