US3721639A
Expired / Lapsed
US
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Process for casting polyphenylene oxide films on stainless steel supports using a vegetable oil additive
Assignee: Individual
•
Filing: 1971-07-19
•
Granted: 1973-03-20
•
Expires: 1991-07-19
Abstract
Abstract Polyphenylene oxide containing films which do not adhere to stainless steel casting plates are formed from compositions containing polyphenylene oxide and a vegetable oil which may be epoxidized.
Inventors
- 👤 J Gattus
- 👤 M Mallet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:47
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/15; C08K5/151; C08K5/1515
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
14 words
A process according to claim 1 in which the polyphenylene oxide is poly(2,6-dimethyl-1,4-phenylene oxide).
Claim 2
Dependent Claim
13 words
A process according to claim 1 in which the vegetable oil is epoxidized.
Claim 3
Dependent Claim
34 words
A process according to claim 1 in which the vegetable oil is selected from the group consisting of soya oil, epoxidized soya oil, pine oil, cottonseed oil, colza oil, castor oil and linseed oil.
Claim 4
Dependent Claim
22 words
A process according to claim 1 in which the casting composition contains from 15 to 25 percent by weight of polyphenylene oxide.
Claim 5
Dependent Claim
27 words
A process according to claim 1 in which the casting composition contains from 1 to 5 percent by weight of vegetable oil, relative to the polyphenylene oxide.
Claim 6
Dependent Claim
19 words
A process according to claim 1 in which the casting composition additionally comprises a solvent for the polyphenylene oxide.
Claim 7
Dependent Claim
19 words
A process according to claim 1 in which the casting composition additionally comprises silica of combustion as a filler.
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) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |