US2803047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making shell molds
Assignee: Eaton Corp
•
Filing: 1952-06-26
•
Granted: 1957-08-20
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Expires: 1972-06-26
Abstract
No abstract record available.
Inventors
- 👤 Roy S Dahmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:39
CPC Classifications
B; B22; B22C; B22C23/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
IN A PROCESS FOR MAKING SHELL MOLDS WHEREIN A THIN LAYER OF A MIXTURE OF SAND AND A THERMOSETTING RESIN IS FORMED ON THE SURFACE OF A PATTERN, THE RESIN COMPONENT OF SAID MIXTURE BEING IN A PARTIALLY POLYMERIZED STATE, THE IMPROVEMENT WHICH COMPRISES THE STEPS OF POSITIONING A HEATED SUPPORT PLATE ON THE REAR SURFACE OF SAID LAYER ON SAID PATTERN AND EFFECTING A TRANSFER OF SAID LAYER FROM THE PATTERN SURFACE TO SAID HEATED SUPPORT PLATE WHILE MAINTAINING THE CONTOURS IN SAID LAYER IMPARTED BY SAID PATTERN, AND THEREAFTER CURING THE RESINOUS COMPONENTS IN SAID LAYER WITH HEAT SUPPLIED BY SAID HEATED PLATE TO AN INSOLUBLE, INFUSIBLE STATE WIHILE SAID LAYER AND SAID PLATE ARE IN INTIMATE CONTACT.
Claim 2
Dependent Claim
120 words
IN A PROCESS FOR MAKING SHELL MOLDS WHEREIN A THIN LAYER OF A MIXTURE OF SAND AND A THERMOSETTING RESIN IS FORMED ON THE SURFACE OF A PATTERN, THE RESIN COMPONENT OF SAID MIXTURE BEING IN A PARTIALLY POLYMERIZED STATE, THE IMPROVEMENT WHICH COMPRISES THE STEPS OF POSITIONING A HEATED SUPPORT PLATE ON THE REAR SURFACE OF SAID LAYER ON SAID PATTERN AND EFFECTING A TRANSFER OF SAID LAYER FROM THE PATTERN SURFACE TO SAID HEATED SUPPORT PLATE WHILE MAINTAINING THE CONTOURS IN SAID LAYER IMPARTED BY SAID PATTERN, AND THEREAFTER CURING THE RESINOUS COMPONENTS IN SAID LAYER WITH HEAT SUPPLIED BY SAID HEATED PLATE TO AN INSOLUBLE, INFUSIBLE STATE WIHILE SAID LAYER AND SAID PLATE ARE IN INTIMATE CONTACT.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-19 | 1961-02-18 | 1961-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-19 | 1965-02-18 | 1965-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-19 | 1969-02-18 | 1969-08-20 | $7700.00 | Window Closed / Lapsed |