Patent US3139657A successfully refreshed from Google Patents.
US3139657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Curing epoxide resin compositions
Assignee: Union Oil Company of California
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Filing: 1960-01-11
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Granted: 1964-07-07
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Expires: 1980-01-11
Abstract
No abstract record available.
Inventors
- 👤 George P Maly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:38
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/162; C; C08; C08G; C08G59/00; C08G59/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
METHOD FOR FABRICATING SHELL MOLDS AND LIKE STRUCTURES WHICH COMPRISES FORMING A POROUS AND PERMEABLE MASS ABOUT AN UNHEATED MOLD PATTERN, SAID MASS CONSISTING ESSENTIALLY OF BETWEEN ABOUT 85 TO 98 PARTS SAND HAVING AN AFS FINENESS NUMBER BETWEEN ABOUT 20 AND 200 AND BETWEEN ABOUT 2 AND 15 PARTS OF AN EPOXIDE RESIN AS A FILM HAVING A THICKNESS NO GREATER THAN ABOUT 0.01 INCH ON THE GRAINS OF SAID SAND, THEREAFTER CURE HARDENING SAID RESIN BY PASSING A NORMALLY GASEOUS EPOXIDE RESIN CURING AGENT IN CONTACT WITH SAID FILM, CEASING SAID CONTACT, EXHAUSTING SAID GASEOUS AGENT FROM SAID MASS AND REMOVING SAID PATTERN FROM THE RESULTANT CONSOLIDATED SHELL.
Claim 2
Dependent Claim
110 words
METHOD FOR FABRICATING SHELL MOLDS AND LIKE STRUCTURES WHICH COMPRISES FORMING A POROUS AND PERMEABLE MASS ABOUT AN UNHEATED MOLD PATTERN, SAID MASS CONSISTING ESSENTIALLY OF BETWEEN ABOUT 85 TO 98 PARTS SAND HAVING AN AFS FINENESS NUMBER BETWEEN ABOUT 20 AND 200 AND BETWEEN ABOUT 2 AND 15 PARTS OF AN EPOXIDE RESIN AS A FILM HAVING A THICKNESS NO GREATER THAN ABOUT 0.01 INCH ON THE GRAINS OF SAID SAND, THEREAFTER CURE HARDENING SAID RESIN BY PASSING A NORMALLY GASEOUS EPOXIDE RESIN CURING AGENT IN CONTACT WITH SAID FILM, CEASING SAID CONTACT, EXHAUSTING SAID GASEOUS AGENT FROM SAID MASS AND REMOVING SAID PATTERN FROM THE RESULTANT CONSOLIDATED SHELL.
References Cited (Backward Citations)
CA531968A
Cited
CA542111A
Cited
US2476726A
Cited
US2735829A
Cited
US2846742A
Cited
US2895838A
Cited
US3008205A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-07 | 1968-01-06 | 1968-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-07 | 1972-01-06 | 1972-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-07 | 1976-01-06 | 1976-07-07 | $7700.00 | Window Closed / Lapsed |