US2628394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Replicas for use in the production of refractory molds
Assignee: EMERIK IMRE VALYI
•
Filing: 1950-06-17
•
Granted: 1953-02-17
•
Expires: 1970-06-17
Abstract
No abstract record available.
Inventors
- 👤 Ilsabe E Valyi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:23
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/02; B22C9/04; Y; Y10; Y10T; Y10T74/00; Y10T74/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
THE METHOD OF PRODUCING REFRACTORY MOLDS FOR INDUSTRIAL PRECISION CASTING, WHICH COMPRISES EMBEDDING IN AN INVESTMENT COMPOSITION A PLASTIC REPLICA CONSISTING ESSENTIALLY OF POLYSTYRENE HAVING AN INTRINSIC VISCOSITY IN TOLUENE OF 0.142 TO 0.75, CORRESPONDING TO CALCULATED VISCOSITY AVERAGE MOLECULAR WEIGHT OF 9,500 TO 50,000, SAID REPLICA HAVING MOLD CAVITY FORMING PARTS WITH EXTERIOR SURFACES CONFORMING TO THE EXTERIOR SURFACE OF THE ARTICLE TO BE CAST, HAVING THE PROPERTY OF BEING RIGID AT ROOM TEMPERATURE, SOFTENING AT HIGHER TEMPERATURE WITH THERMAL EXPANDSION IN AN AMOUNT WHICH IS INSUFFICIENT TO INJURE THE MOLD, AND BEING COMPLETELY COMBUSTIBLE AT MOLD FIRING TEMPERATURE, SUBJECTING THE ASSEMBLY TO CONDITIONS OF TEMPERATURE AND TIME TO CAUSE SOLIDIFICATION OF THE INVESTMENT, REMOVAL OF THE REPLICA BY SOFTENING AND COMBUSTION TO LEAVE A MOLD CAVITY, AND CONVERSION OF THE SOLIDFIED INVESTMENT TO A REFRACTORY MODE.
Claim 2
Independent Claim
138 words
THE METHOD OF PRODUCING REFRACTORY MOLDS FOR INDUSTRIAL PRECISION CASTING, WHICH COMPRISES EMBEDDING IN AN INVESTMENT COMPOSITION A PLASTIC REPLICA CONSISTING ESSENTIALLY OF POLYSTYRENE HAVING AN INTRINSIC VISCOSITY IN TOLUENE OF 0.142 TO 0.75, CORRESPONDING TO CALCULATED VISCOSITY AVERAGE MOLECULAR WEIGHT OF 9,500 TO 50,000, SAID REPLICA HAVING MOLD CAVITY FORMING PARTS WITH EXTERIOR SURFACES CONFORMING TO THE EXTERIOR SURFACE OF THE ARTICLE TO BE CAST, HAVING THE PROPERTY OF BEING RIGID AT ROOM TEMPERATURE, SOFTENING AT HIGHER TEMPERATURE WITH THERMAL EXPANDSION IN AN AMOUNT WHICH IS INSUFFICIENT TO INJURE THE MOLD, AND BEING COMPLETELY COMBUSTIBLE AT MOLD FIRING TEMPERATURE, SUBJECTING THE ASSEMBLY TO CONDITIONS OF TEMPERATURE AND TIME TO CAUSE SOLIDIFICATION OF THE INVESTMENT, REMOVAL OF THE REPLICA BY SOFTENING AND COMBUSTION TO LEAVE A MOLD CAVITY, AND CONVERSION OF THE SOLIDFIED INVESTMENT TO A REFRACTORY MODE.
References Cited (Backward Citations)
US2211689A
Cited
US2362507A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-02-17 | 1956-08-18 | 1957-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-17 | 1960-08-18 | 1961-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-17 | 1964-08-18 | 1965-02-17 | $7700.00 | Window Closed / Lapsed |