US3876607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Epoxy compositions
Assignee: Individual
•
Filing: 1974-07-10
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Granted: 1975-04-08
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Expires: 1994-07-10
Abstract
Abstract At high temperatures, properties such as longitudinal flexural strength and overlap shear strength of epoxy resin compositions are substantially improved by inclusion of aromatic dicyanate.
Inventors
- 👤 John B Snell
- 👤 Doris A Wambach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:47
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/20; C08G59/32; C08G59/40; C08G59/4007; C08G59/4014; C08G59/4021; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31518; Y10T442/00; Y10T442/20; Y10T442/2738; Y10T442/2926; Y10T442/2951
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A CURABLE COMPOSITION COMPRISING AN EPOXY RESIN MIXTURE CONSISTING ESSENTIALLY OF EPOXIDIZED CRESOL NOVOLAC RESIN AND EPOXIDIZED AMINOPHENOL RESIN AND AN EFFECTIVE AMOUNT OF A MIXED CURING AGENT THEREFOR CONSISTING ESSENTIALLY OF A. FROM 1-15% OF THE EPOXY EQUIVALENTS OF AROMATIC DICYANATE SELECTED FROM THE GROUP CONSISTING OF BISPHENOL A DICYANATE AND BISPHENOL B DICYANATE AND B. AN EFFECTIVE AMOUNT OF DICYANDIAMIDE CURING AGENT SUFFICIENT TO CURE SAID RESIN TO A HARD CURED PRODUCT, SAID MIXED CURING AGENT BEING CAPABLE OF CURING SAID RESIN TO A HARD CURED PRODUCT WHICH HAS HEAT RESISTANCE PROPERTIES APPRECIABLY IMPROVED IN THE NEIGHBORHOOD OF 215*C. OVER THOSE HEAT RESISTANCE PROPERTIES OF THE CURED PRODUCT PRODUCED WITH (B) ALONE AND OVER THOSE HEAT RESISTANCE PROPERTIES OF A CURED PRODUCT PRODUCED BY SUFFICIENT (A) ALONE TO CURE SAID RESIN TO A HARD CURED PRODUCT.
Claim 2
Dependent Claim
138 words
A CURABLE COMPOSITION COMPRISING AN EPOXY RESIN MIXTURE CONSISTING ESSENTIALLY OF EPOXIDIZED CRESOL NOVOLAC RESIN AND EPOXIDIZED AMINOPHENOL RESIN AND AN EFFECTIVE AMOUNT OF A MIXED CURING AGENT THEREFOR CONSISTING ESSENTIALLY OF A. FROM 1-15% OF THE EPOXY EQUIVALENTS OF AROMATIC DICYANATE SELECTED FROM THE GROUP CONSISTING OF BISPHENOL A DICYANATE AND BISPHENOL B DICYANATE AND B. AN EFFECTIVE AMOUNT OF DICYANDIAMIDE CURING AGENT SUFFICIENT TO CURE SAID RESIN TO A HARD CURED PRODUCT, SAID MIXED CURING AGENT BEING CAPABLE OF CURING SAID RESIN TO A HARD CURED PRODUCT WHICH HAS HEAT RESISTANCE PROPERTIES APPRECIABLY IMPROVED IN THE NEIGHBORHOOD OF 215*C. OVER THOSE HEAT RESISTANCE PROPERTIES OF THE CURED PRODUCT PRODUCED WITH (B) ALONE AND OVER THOSE HEAT RESISTANCE PROPERTIES OF A CURED PRODUCT PRODUCED BY SUFFICIENT (A) ALONE TO CURE SAID RESIN TO A HARD CURED PRODUCT.
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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |