Patent US2281988A successfully refreshed from Google Patents.
US3030247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stable heat-curing epoxy resin compositions
Assignee: 3M Co
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Filing: 1955-07-28
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Granted: 1962-04-17
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Expires: 1975-07-28
Abstract
No abstract record available.
Inventors
- 👤 Joseph N Schurb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:03
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/4007; C08G59/4014; C08G59/4021; C08G59/4035; C08G59/50; C08G59/5046; C08G59/5053; C08G59/508; C08G59/5086; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24132
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A STABLE COMPOSITION OF MATTER HAVING A PROLONGED SHELF LIFE AT NORMAL ROOM TEMPERATURES AND CAPABLE OF RAPIDLY CURING TO A UNIFORMLY HARD, TOUGH STATE AT MODERATELY ELEVATAED TEMPERATURES, COMPRISING A BLEND OF (1) AN EPOXY RESIN HAVING AN AVERAGE OF MORE THAN ONE 1,2EPOXY GROUP PER AVERAGE MOLECULAR WEIGHT AND (2) COMPATIBLE LATENT CHEMICAL HARDENING AGENT FOR EPOXY RESIN IN SUCH PROPORATION THAT ABOUTS 2/3 TO 4/3 ACTIVE HYDROGENS OF HARDENING AGENT ARE PRESENT IN THE RESIN COMPOSITION PER EPOXY GROUP, SAID HARDENING AGENT BEING A MIXTURE OF (A) A MEMBER OF THE GROUP CONSISTING OF DICYANDIAMIDE AND POLYFUNCTIONAL CARBOXYLIC ACYL HYDRAZIDE AND (B) AT LEAST ABOUT 2 PARTS PER 100 PARTS EPOXY RESIN OF A COMPATIBLE POLYFUNCTIONAL HARDENER COMPOUND OF THE FORMULA:
Claim 2
Dependent Claim
124 words
A STABLE COMPOSITION OF MATTER HAVING A PROLONGED SHELF LIFE AT NORMAL ROOM TEMPERATURES AND CAPABLE OF RAPIDLY CURING TO A UNIFORMLY HARD, TOUGH STATE AT MODERATELY ELEVATAED TEMPERATURES, COMPRISING A BLEND OF (1) AN EPOXY RESIN HAVING AN AVERAGE OF MORE THAN ONE 1,2EPOXY GROUP PER AVERAGE MOLECULAR WEIGHT AND (2) COMPATIBLE LATENT CHEMICAL HARDENING AGENT FOR EPOXY RESIN IN SUCH PROPORATION THAT ABOUTS 2/3 TO 4/3 ACTIVE HYDROGENS OF HARDENING AGENT ARE PRESENT IN THE RESIN COMPOSITION PER EPOXY GROUP, SAID HARDENING AGENT BEING A MIXTURE OF (A) A MEMBER OF THE GROUP CONSISTING OF DICYANDIAMIDE AND POLYFUNCTIONAL CARBOXYLIC ACYL HYDRAZIDE AND (B) AT LEAST ABOUT 2 PARTS PER 100 PARTS EPOXY RESIN OF A COMPATIBLE POLYFUNCTIONAL HARDENER COMPOUND OF THE FORMULA:
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) | 1965-04-16 | 1965-10-16 | 1966-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-16 | 1969-10-16 | 1970-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-16 | 1973-10-16 | 1974-04-17 | $7700.00 | Window Closed / Lapsed |