Patent US3914512A successfully refreshed from Google Patents.
US3914512A
Expired / Lapsed
US
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Polyepoxy resin-diaryl dianhydride laminating resins and laminates
Assignee: Gulf Research and Development Co
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Filing: 1972-11-29
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Granted: 1975-10-21
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Expires: 1992-11-29
Abstract
Abstract A stable diaryl dianhydride-epoxy resin solution for preparing handleable, formable resin-impregnated reinforcing material and fully cured laminates. A non-viscous solution of 3,4,3'',4''benzophenone tetracarboxylic dianhydride and the reaction product of epichlorohydrin and bisphenol A is obtained in acetone.
Inventors
- 👤 Jr Walter P Barie
- 👤 Norman W Franke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:09
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/20; C08G59/22; C08G59/24; C08G59/245; C08G59/40; C08G59/42; C08J; C08J5/00; C08J5/24; C08J5/241; C08J5/244; C08J5/249; C08K; C08K5/00; C08K5/04; C08K5/09; C08K7/00; C08K7/02; C08K7/04; C08K7/14; C08J2363/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
31 words
A FORMABLE, HANDABLE LAMINA OF RESIN-IMPREGNATED REINFORCING MATERIAL CAPABLE OF BEING CURED TO A CLEAR HANS REINFORCEMENT RESIN COMPRISES A SHEET OF FIBROUS REINFORCING MATERIAL IMPREGNATED WITH A HOMOGENEOUS MIXTURE OF
Claim 2
Dependent Claim
31 words
A FORMABLE, HANDABLE LAMINA OF RESIN-IMPREGNATED REINFORCING MATERIAL CAPABLE OF BEING CURED TO A CLEAR HANS REINFORCEMENT RESIN COMPRISES A SHEET OF FIBROUS REINFORCING MATERIAL IMPREGNATED WITH A HOMOGENEOUS MIXTURE OF
Claim 3
Dependent Claim
17 words
A NONPLASTICIZING 1,2-EPOXY RESIN WHICH CONTAINS ON THE AVERAGE MORE THAN ONE 1,2-EPOXY GROUP PER MOLECULE, AND
Claim 4
Dependent Claim
17 words
A NONPLASTICIZING 1,2-EPOXY RESIN WHICH CONTAINS ON THE AVERAGE MORE THAN ONE 1,2-EPOXY GROUP PER MOLECULE, AND
Claim 5
Dependent Claim
22 words
AN ANHYDRIDE HARDNER COMPONENT COMPRISING A. FROM ABOUT 15 TO 100 WEIGHT PERCENT OF A DIARY DIANHY DRIDE HAVING THE STRUCTURAL FORMULA
Claim 6
Dependent Claim
22 words
AN ANHYDRIDE HARDNER COMPONENT COMPRISING A. FROM ABOUT 15 TO 100 WEIGHT PERCENT OF A DIARY DIANHY DRIDE HAVING THE STRUCTURAL FORMULA
Claim 7
Dependent Claim
21 words
an anhydride hardener component comprising a. from about 15 to 100 weight percent of a diaryl dianhydride having the structural formula
Claim 8
Dependent Claim
21 words
an anhydride hardener component comprising a. from about 15 to 100 weight percent of a diaryl dianhydride having the structural formula
Claim 9
Dependent Claim
42 words
A formable, handleable lamina of resin-impregnated reinforcing material in accordance with claim 1 in which the A/E ratio is between about 0.6 and about 0.85 and the diaryl dianhydride comprises from about 25 percent to about 50 percent of the anhydride component.
Claim 10
Dependent Claim
29 words
A formable, handleable lamina of resin-impregnated reinforcing material in accordance with claim 2 in which the diaryl dianhydride is 3,4,3'',4''-benzophenone tetracarboxylic dianhydride and the reinforcing material is fiber glass.
Claim 11
Dependent Claim
42 words
A formable, handleable lamina of resin-impregnated reinforcing material in accordance with claim 3 in which the epoxy resin is the reaction product of epichlorohydrin and a dihydric phenol and the monoanhydride is maleic anhydride or a mixture of methylbicyclo(2.2.1) heptene-2,3-dicarboxylic anhydride isomers.
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) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |