Patent US2964500A successfully refreshed from Google Patents.
US2964500A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of formaldehyde polymers with improved thermal stability
Assignee: EIDP Inc
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Filing: 1958-09-29
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Granted: 1960-12-13
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Expires: 1978-09-29
Abstract
No abstract record available.
Inventors
- 👤 Jr Sidney Hartman Jenkins
- 👤 Punderson John Oliver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:55
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/30; C08G2/32; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582; Y10; Y10S; Y10S74/00; Y10S74/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
THE PROCESS COMPRISING REACTING A MIXTURE OF A POLYOXYMETHLENE, HAVING A NUMBER AVERAGE MOLECULAR WEIGHT OF AT LEAST 15,000 AND HAVING AT LEAST ONE OF THE TWO TERMINALS OF THE POLOXYMETHYLENE CHAIN OCCUPIED BY A HYDROXYL GROUP, 2-20 PARTS BY WEIGHT PER PART OF SAID POLYOXYMETHYLENE OF AN ANHYDRIDE OF A SATURATED, MONOBASIC, CARBOXYLIC ACID, AND 0.002%-10% BY WEIGHT OF SAID ANYDRIDE, OF A SALT WHOSE CATION IS AN ALKALI METAL AND WHOSE ANION IS THE NEGATIVE ION PRODUCT OBTAINED BY REMOVING A HYDROGEN ATOM FROM AN ACID HAVING A DISSOCIATION CONSTANT WHICH IS LESS THAN 1.8X10**-4 AT 25*C. THE TEMPERATURE OF THE REACTING MIXTURE BEING FROM 50*C. TO THE BOILING POINT OF THE SAID MIXTUREE.
Claim 2
Dependent Claim
116 words
THE PROCESS COMPRISING REACTING A MIXTURE OF A POLYOXYMETHLENE, HAVING A NUMBER AVERAGE MOLECULAR WEIGHT OF AT LEAST 15,000 AND HAVING AT LEAST ONE OF THE TWO TERMINALS OF THE POLOXYMETHYLENE CHAIN OCCUPIED BY A HYDROXYL GROUP, 2-20 PARTS BY WEIGHT PER PART OF SAID POLYOXYMETHYLENE OF AN ANHYDRIDE OF A SATURATED, MONOBASIC, CARBOXYLIC ACID, AND 0.002%-10% BY WEIGHT OF SAID ANYDRIDE, OF A SALT WHOSE CATION IS AN ALKALI METAL AND WHOSE ANION IS THE NEGATIVE ION PRODUCT OBTAINED BY REMOVING A HYDROGEN ATOM FROM AN ACID HAVING A DISSOCIATION CONSTANT WHICH IS LESS THAN 1.8X10**-4 AT 25*C. THE TEMPERATURE OF THE REACTING MIXTURE BEING FROM 50*C. TO THE BOILING POINT OF THE SAID MIXTUREE.
References Cited (Backward Citations)
US2734889A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-13 | 1964-06-13 | 1964-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-13 | 1968-06-13 | 1968-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-13 | 1972-06-13 | 1972-12-13 | $7700.00 | Window Closed / Lapsed |