US3842046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamides of trimethylhexamethylenediamine cycloaliphatic dicarboxylic acid and carbocyclic aromatic dicarboxylic acid
Assignee: Veba Oel AG
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Filing: 1972-07-14
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Granted: 1974-10-15
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Expires: 1992-07-14
Abstract
Abstract 1. POLYAMIDE CONSISTING ESSENTIALLY OF POLYMERIC CONDENSATION PRODUCT OF (1) 2,4,4-TRIMTHYLHEXAMETHYLENEDIAMINE, 2,2,4-TRIMETHYLHEXAMETHYLENEDIAMINE, OR A MIXTURE THEREOF, (2) 1,4-CYCLOHEXANE DICARBOXYLIC ACID, 1,3CYCLOHEXANE DICARBOXYLIC ACID OR A MIXTURE THEREOF, AND (3) BENZENE DICARBOXYLIC ACID, THE CYCLOHEXANE AND BENZENE DICARBOXYLIC ACIDS BEING IN THE MOLAR RATIO OF 25:75 TO 75:25, SAID POLYAMIDE HAVING A NUMERICAL AVERAGE MOLECULAR WEIGHT GREATER THAN 15,000 AS DETERMINED BY MEASURING THE REDUCE VISCOSITY OF SAID POLYAMIDE IN A 1% SOLUTION IN PURE FORMIC ACID AT 20*C.
Inventors
- 👤 S Brandt
- 👤 K Schmitt
- 👤 F Gude
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:07
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
POLYAMIDE CONSISTING ESSENTIALLY OF POLYMERIC CONDENSATION PRODUCT OF (1) 2,4,4-TRIMTHYLHEXAMETHYLENEDIAMINE, 2,2,4-TRIMETHYLHEXAMETHYLENEDIAMINE, OR A MIXTURE THEREOF, (2) 1,4-CYCLOHEXANE DICARBOXYLIC ACID, 1,3CYCLOHEXANE DICARBOXYLIC ACID OR A MIXTURE THEREOF, AND (3) BENZENE DICARBOXYLIC ACID, THE CYCLOHEXANE AND BENZENE DICARBOXYLIC ACIDS BEING IN THE MOLAR RATIO OF 25:75 TO 75:25, SAID POLYAMIDE HAVING A NUMERICAL AVERAGE MOLECULAR WEIGHT GREATER THAN 15,000 AS DETERMINED BY MEASURING THE REDUCE VISCOSITY OF SAID POLYAMIDE IN A 1% SOLUTION IN PURE FORMIC ACID AT 20*C.
Claim 2
Dependent Claim
77 words
POLYAMIDE CONSISTING ESSENTIALLY OF POLYMERIC CONDENSATION PRODUCT OF (1) 2,4,4-TRIMTHYLHEXAMETHYLENEDIAMINE, 2,2,4-TRIMETHYLHEXAMETHYLENEDIAMINE, OR A MIXTURE THEREOF, (2) 1,4-CYCLOHEXANE DICARBOXYLIC ACID, 1,3CYCLOHEXANE DICARBOXYLIC ACID OR A MIXTURE THEREOF, AND (3) BENZENE DICARBOXYLIC ACID, THE CYCLOHEXANE AND BENZENE DICARBOXYLIC ACIDS BEING IN THE MOLAR RATIO OF 25:75 TO 75:25, SAID POLYAMIDE HAVING A NUMERICAL AVERAGE MOLECULAR WEIGHT GREATER THAN 15,000 AS DETERMINED BY MEASURING THE REDUCE VISCOSITY OF SAID POLYAMIDE IN A 1% SOLUTION IN PURE FORMIC ACID AT 20*C.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |