Patent US2861972A successfully refreshed from Google Patents.
US2861972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High molecular weight cross-linked polyester-urethane elastomer products
Assignee: Bayer AG
•
Filing: 1954-06-02
•
Granted: 1958-11-25
•
Expires: 1974-06-02
Abstract
No abstract record available.
Inventors
- 👤 Karl E Muller
- 👤 Bayer Otto
- 👤 Petersen Siegfried
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:40
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6633; C08G18/6637; C08G18/664; C08G18/08; C08G18/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
IN A PROCESS OF FORMING A HIGH MOLECULAR WEIGHT CROSS-LINKED PRODUCT BY REACTING AN ORGANIC DIISOCYANATE AND AN AROMATIC GLYCOL WITH AN ANHYDROUS ORGANIC LINEAR POLYESTER HAVING FROM 0.6-2.4% BY WEIGHT OF HYDROXYL GROUPS AND AN ACID VALUE SUBSTANTIALLY NOT EXCEEDING 1, SAID POLYESTER BEING PREPARED SUBSTANTIALLY FROM A SATURATED ALIPHATIC DICARBOXYLIC ACID AND A GLYCOL, THE IMPROVEMENT COMPRISING EMPLOYING AS THE AROMATIC GLYCOL TO BE REACTED WITH SAID POLYESTER A COMPOUND HAVING TWO CONDENSED AROMATIC RINGS AND TWO ALIPHATICALLY BONDED -OH GROUPS LINKED TO THE AROMATIC RINGS THROUGH ALKYLENE GROUPS, THE LATTER BEING CONNECTED TO THE AROMATIC RINGS BY A LINKAGE SELECTED FROM THE GROUP CONSISTING OF AN ETHER LINKAGE AND A CARBOXYLIC ESTER LINKAGE.
Claim 2
Dependent Claim
116 words
IN A PROCESS OF FORMING A HIGH MOLECULAR WEIGHT CROSS-LINKED PRODUCT BY REACTING AN ORGANIC DIISOCYANATE AND AN AROMATIC GLYCOL WITH AN ANHYDROUS ORGANIC LINEAR POLYESTER HAVING FROM 0.6-2.4% BY WEIGHT OF HYDROXYL GROUPS AND AN ACID VALUE SUBSTANTIALLY NOT EXCEEDING 1, SAID POLYESTER BEING PREPARED SUBSTANTIALLY FROM A SATURATED ALIPHATIC DICARBOXYLIC ACID AND A GLYCOL, THE IMPROVEMENT COMPRISING EMPLOYING AS THE AROMATIC GLYCOL TO BE REACTED WITH SAID POLYESTER A COMPOUND HAVING TWO CONDENSED AROMATIC RINGS AND TWO ALIPHATICALLY BONDED -OH GROUPS LINKED TO THE AROMATIC RINGS THROUGH ALKYLENE GROUPS, THE LATTER BEING CONNECTED TO THE AROMATIC RINGS BY A LINKAGE SELECTED FROM THE GROUP CONSISTING OF AN ETHER LINKAGE AND A CARBOXYLIC ESTER LINKAGE.
References Cited (Backward Citations)
GB581146A
Cited
US2729618A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-24 | 1962-05-26 | 1962-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-24 | 1966-05-26 | 1966-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-24 | 1970-05-26 | 1970-11-25 | $7700.00 | Window Closed / Lapsed |