US3025263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Epoxy carboxylic acid dianhydride compositions
Assignee: Individual
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Filing: 1957-07-31
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Granted: 1962-03-13
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Expires: 1977-07-31
Abstract
No abstract record available.
Inventors
- 👤 Jr Henry L Lee
- 👤 Kris O Neville
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:28
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/42; C08G59/4223; C08K; C08K3/00; C08K3/34; Y; Y10; Y10T; Y10T442/00; Y10T442/20; Y10T442/2926; Y10T442/2992; Y10T442/30; Y10T442/3472; Y10T442/3528; Y10T442/3569; Y10T442/3585
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A COMPOSITION OF MATTER CONSISTING ESSENTIALLY OF (1) A 1,2-EPOXY RESIN CONTAINING AN AVERAGE OF MORE THAN ONE EPOXY GROUP PER RESIN MOLECULE, (2) AN EPOXY RESIN CURING AGENT CONSISTING ESSENTIALLY OF PYROMELLITIC ACID DIANHYDRIDE, SAID CURING AGENT BEING PRESENT IN AN AMOUNT REQUISITE TO PROVIDE FROM ABOUT 0.3 TO ABOUT 0.6 ANHYDRIDE EQUIVALENTS PER EPOXIDE EQUIVALENT OF SAID EPOXY RESIN AVAILABLE FOR REACTION WITH SAID CURING AGENT, AND (3) A FINELY DIVIDED INORGANIC FILLER CONSISTING OF TALC CHARACTERIZED BY A PH OF FROM ABOUT 7 TO 9.
Claim 2
Dependent Claim
88 words
A COMPOSITION OF MATTER CONSISTING ESSENTIALLY OF (1) A 1,2-EPOXY RESIN CONTAINING AN AVERAGE OF MORE THAN ONE EPOXY GROUP PER RESIN MOLECULE, (2) AN EPOXY RESIN CURING AGENT CONSISTING ESSENTIALLY OF PYROMELLITIC ACID DIANHYDRIDE, SAID CURING AGENT BEING PRESENT IN AN AMOUNT REQUISITE TO PROVIDE FROM ABOUT 0.3 TO ABOUT 0.6 ANHYDRIDE EQUIVALENTS PER EPOXIDE EQUIVALENT OF SAID EPOXY RESIN AVAILABLE FOR REACTION WITH SAID CURING AGENT, AND (3) A FINELY DIVIDED INORGANIC FILLER CONSISTING OF TALC CHARACTERIZED BY A PH OF FROM ABOUT 7 TO 9.
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) | 1965-03-12 | 1965-09-11 | 1966-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-03-12 | 1969-09-11 | 1970-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-03-12 | 1973-09-11 | 1974-03-13 | $7700.00 | Window Closed / Lapsed |