Patent US4418818A successfully refreshed from Google Patents.
US3660193A
Expired / Lapsed
US
⏱️ 0.0 years remaining
A{14 i polymer laminates prepared by filament winding
Assignee: Standard Oil Co
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Filing: 1971-03-05
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Granted: 1972-05-02
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Expires: 1991-03-05
Abstract
Abstract A continuous process for preparing a heat resistant polymer laminate, said process comprising: (1) coating glass fibers with a solution comprising an uncured aromatic polytrimellitamide polymer, having imide forming groups, dissolved in a suitable solvent, (2) flashing off a limited amount of solvent at a temperature below the curing temperature of said uncured aromatic polytrimellitamide polymer, leaving said polymer uniformly deposited on the surface of said fibers, (3) winding said fibers on a mandrel, and (4) curing the polymer leaving essentially no unconverted imide forming groups, thus preparing said polymer laminates.
Inventors
- 👤 Benjamin A Bolton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:37
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/04; C08J5/0405; C08J5/043; C08J2379/00; C08J2379/04; C08J2379/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
17 words
The process of claim 1 wherein the glass fibers used are in the forms of glass roving.
Claim 2
Dependent Claim
23 words
The process of claim 1 wherein the glass fibers are coated with said uncured amide-imide polymer by immersing said fibers in said solution.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein said winding is performed with a helix angle of about 53 3/4 *.
Claim 4
Dependent Claim
16 words
The process of claim 1 wherein the tension on said glass fibers is about 56 pounds.
Claim 5
Dependent Claim
26 words
The process of claim 1 wherein said winding is accomplished by rotating said mandrel at a speed of about 7 1/2 to 10 revolutions per minute.
Claim 6
Dependent Claim
24 words
The process of claim 1 wherein the curing is accomplished by heating for 1 hour each at 250*, 300*, 350*, 400* and 450* F.
Claim 7
Dependent Claim
19 words
The process of claim 1 wherein said polymer solution comprises: 10-30 wt. percent A-I polymer having the following structure,
Claim 8
Dependent Claim
104 words
A continuous process for preparing a heat resistant polymer laminate, said process comprising: (1) coating glass fibers with a solution comprising an uncured aromatic polytrimellitamide polymer, having imide forming groups, dissolved in a suitable solvent, (2) flashing off a limited amount of solvent thereby reducing the amount of solvent remaining to between about 10 and 20 weight percent based upon the total weight of the coated glass fibers, leaving said uncured polymer uniformly deposited on the surface of said fibers, (3) winding said fibers on a mandrel, and (4) curing the polymer leaving essentially no unconverted imide forming groups, thus preparing said polymer laminates.
Claim 9
Dependent Claim
17 words
The process of claim 9 wherein the glass fibers used are in the forms of glass roving.
Claim 10
Dependent Claim
23 words
The process of claim 9 wherein the glass fibers are coated with said uncured amide-imide polymer by immersing said fibers in said solution.
Claim 11
Dependent Claim
19 words
The process of claim 9 wherein said polymer solution comprises: 10-30 weight percent A-I polymer having the following structure,
Claim 12
Dependent Claim
24 words
The process of claim 1 wherein the curing is accomplished by heating for 1 hour each at 250*, 300*, 350*, 400*, and 450* F.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |