Patent US3604257A successfully refreshed from Google Patents.
US3604257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of testing and selecting glass cloth for use in polyimide composites
Assignee: Individual
•
Filing: 1969-01-31
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Granted: 1971-09-14
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Expires: 1989-01-31
Abstract
Abstract A method for the testing and selecting of glass cloth suitable for use in the preparation of polyimide resin impregnated composites. The method comprises determining the extractable polyol content of the glass cloth and then selecting glass cloth having an extractable polyol content of from 0.60 to 0.90 percent by weight based on the weight of the glass cloth for use in the preparation of the polyimide resin impregnated composite.
Inventors
- 👤 Irving Serlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:20
CPC Classifications
G; G01; G01N; G01N25/00; G01N25/14
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
9 words
extracting the polyol from the sample of glass cloth;
Claim 2
Dependent Claim
9 words
extracting the glycerine from the sample of glass cloth;
Claim 3
Dependent Claim
9 words
extracting the glycerine from the sample of glass cloth;
Claim 4
Dependent Claim
22 words
A method as in claim 1 wherein the polyol is extracted using a Soxhlet extraction apparatus and an organic solvent extraction liquid.
Claim 5
Dependent Claim
8 words
determining the amount of glycerine extracted, and then
Claim 6
Dependent Claim
12 words
determining the extractable glycerine content of the sample of glass cloth; and
Claim 7
Dependent Claim
15 words
A method as in claim 2 wherein the organic solvent is a lower aliphatic alcohol.
Claim 8
Dependent Claim
8 words
determining the amount of polyol extracted; and then
Claim 9
Dependent Claim
37 words
approving glass cloth with an extractable glycerine content in the range of from 0.60 percent to 0.90 percent by weight based on the weight of the glass cloth for use in the preparation of the polyimide composite.
Claim 10
Dependent Claim
33 words
approving glass cloth with an extractable glycerine content of from 0.60 to 0.90 percent by weight based on the weight of the glass cloth for use in the preparation of the polyimide composite.
Claim 11
Dependent Claim
33 words
approving glass cloth with an extractable polyol content of from 0.60 to 0.90 percent by weight based on the weight of the glass cloth for use in the preparation of the polyimide composite.
Claim 12
Dependent Claim
13 words
A method as in claim 3 wherein the lower aliphatic alcohol is methanol.
Claim 13
Dependent Claim
12 words
A method as in claim 3 wherein the organic solvent is ethanol.
Claim 14
Independent Claim
37 words
A method for the testing of glass cloth, which has been previously treated with an amino propyl triethoxy silane-glycerine finish, in order to select glass cloth suitable for use in polyimide resin-glass cloth composites which method comprises:
Claim 15
Dependent Claim
22 words
A method as in claim 6 wherein the glycerine is extracted using a Soxhlet extraction apparatus and an organic solvent extraction liquid.
Claim 16
Dependent Claim
15 words
A method as in claim 7 wherein the organic solvent is a lower aliphatic alcohol.
Claim 17
Dependent Claim
13 words
A method as in claim 8 wherein the lower aliphatic alcohol is methanol.
Claim 18
Dependent Claim
13 words
A method as in claim 8 wherein the lower aliphatic alcohol is ethanol.
Claim 19
Dependent Claim
41 words
In the method for the preparation of polyimide composites comprising glass cloth impregnated with a polyimide resin wherein the glass cloth has been treated with an aminopropyl triethoxy silane-glycerine finish prior to the preparation of the composite, the improvement which comprises:
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) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |