Patent US760729A successfully refreshed from Google Patents.
Patent US4041065A successfully refreshed from Google Patents.
US4041065A
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Polyamide-imides prepared from 4-carboxy-phthalimide aliphatic carboxylic acids
Assignee: BP Corp North America Inc
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Filing: 1975-01-24
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Granted: 1977-08-09
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Expires: 1995-01-24
Abstract
Abstract Amide-imide type polymers containing amide derivatives of 4-carboxy-phthalimide aliphatic carboxylic acids are useful as wire coatings and in film and molding applications.
Inventors
- 👤 Steven E. Lindberg
- 👤 Kerford A. Marchant, Jr.
- 👤 Richard E. Van Strien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:18
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/14
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
54 words
An amide-imide type polymeric composition with an inherent viscosity of 0.1 to 10.0 consisting essentially of recurrent units of: ##STR4## where A is a difunctional alkylene radical having from 1 to 11 carbon atoms, R is a bivalent hydrocarbon radical having from 2 to 20 carbon atoms, and R' is either hydrogen or methyl.
Claim 2
Dependent Claim
54 words
An amide-imide type polymeric composition with an inherent viscosity of 0.1 to 10.0 consisting essentially of recurrent units of: ##STR4## where A is a difunctional alkylene radical having from 1 to 11 carbon atoms, R is a bivalent hydrocarbon radical having from 2 to 20 carbon atoms, and R' is either hydrogen or methyl.
Claim 3
Dependent Claim
11 words
The composition of claim 1 where A is the pentamethylene radical.
Claim 4
Dependent Claim
11 words
The composition of claim 1 where R is the hexamethylene radical.
Claim 5
Dependent Claim
11 words
The composition of claim 3 where A is the pentamethylene radical.
Claim 6
Dependent Claim
11 words
The composition of claim 1 where R is the ethylene radical.
Claim 7
Dependent Claim
11 words
The composition of claim 5 where A is the pentamethylene radical.
Claim 8
Dependent Claim
11 words
The composition of claim 1 where R is the ##STR5## radical.
Claim 9
Dependent Claim
11 words
The composition of claim 7 where A is the pentamethylene radical.
Claim 10
Dependent Claim
11 words
The composition of claim 1 where R is the ##STR6## radical.
Claim 11
Dependent Claim
11 words
The composition of claim 9 where R is the pentamethylene radical.
References Cited (Backward Citations)
US3461136A
Cited
US3567685A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |