US4098775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel polyamideimides
Assignee: Pharmacia and Upjohn Co
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Filing: 1976-11-15
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Granted: 1978-07-04
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Expires: 1996-11-15
Abstract
Abstract Polyamideimides are described which are derived by conventional procedures from particular 1,1-cycloaliphatic bis(phenylamine) compounds (or the corresponding diisocyanates) and trimellitic acid (preferably through the anhydride acid chloride). The polyamideimides are engineering thermoplastics characterized by the combined properties of solubility, melt processability, and resistance to thermal oxidation.
Inventors
- 👤 Kemal B. Onder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:26
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
68 words
A solvent soluble fusible polyamideimide characterized by having in random arrangement the recurring units having the formulae ##STR11## wherein R in each formula represents the divalent radical ##STR12## wherein x has the value 4 or 5 and Y 1 and Y 2 are independently selected from the group consisting of hydrogen, alkyl having from 1 to 4 carbon atoms, and alkoxy having from 1 to 4 carbon atoms.
Claim 2
Dependent Claim
68 words
A solvent soluble fusible polyamideimide characterized by having in random arrangement the recurring units having the formulae ##STR11## wherein R in each formula represents the divalent radical ##STR12## wherein x has the value 4 or 5 and Y 1 and Y 2 are independently selected from the group consisting of hydrogen, alkyl having from 1 to 4 carbon atoms, and alkoxy having from 1 to 4 carbon atoms.
Claim 3
Dependent Claim
50 words
A solvent soluble fusible polyamideimide according to claim 1 wherein R in each formula represents the divalent radical ##STR13## wherein Y 1 and Y 2 are selected from the group consisting of hydrogen, alkyl having from 1 to 4 carbon atoms, and alkoxy having from 1 to 4 carbon atoms.
Claim 4
Dependent Claim
17 words
A solvent soluble fusible polyamideimide according to claim 2 wherein Y 1 and Y 2 are hydrogen.
References Cited (Backward Citations)
US3260691A
Cited
US3817942A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-03 | 1982-01-02 | 1982-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-03 | 1986-01-02 | 1986-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-03 | 1990-01-02 | 1990-07-04 | $7700.00 | Window Closed / Lapsed |