Patent US3393726A successfully refreshed from Google Patents.
US3393726A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making large precision die castings from cavityless casting molds
Assignee: Schott Metal Products Co
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Filing: 1966-05-09
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Granted: 1968-07-23
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Expires: 1986-05-09
Abstract
No abstract record available.
Inventors
- 👤 Samuel C Schott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:50
CPC Classifications
B; B22; B22C; B22C9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
A METHOD FOR MAKING LARGE PRECISION CASTINGS COMPRISING THE STEPS OF: MAKING AN IMPRESSION OF THE SURFACE OF A MODEL WITH A MATERIAL CAPABLE OF REPRESENTING SUCH SURFACE WITH A SMOOTH PRECISION FACING, COATING THE IMPRESSION WITH A LAYER OF REFRACTORY MATERIAL OF SUFFICIENT THICKNESS TO PROVIDE SUFFICIENT STRENGTH FOR MECHANICAL HANDLING WHEN FIRED, FIRING THE IMPRESSION AND THE REFRACTORY LAYER UNTIL THE REFRACTORY LAYER IS INERT AND THE IMPRESSION HAS DISINTEGRATED, BUILDING UP ON THE FACE OF THE REFRACTORY LAYER REPRESENTING THE IMPRESSION WITH A FORM COMBUSTIBLE SUBSTANTIALLY WITHOUT RESIDUE ON SUBJECTION TO A MOLTEN CASTING CHARGE AND SHAPED TO GIVE A DESIRED BODY AND BULK TO A CASTING HAVING A FORMING DEFINED BY THE FACE OF THE REFRACTORY LAYER REPRESENTING THE IMPRESSIONS, EMBEDDING THE REFRACTORY LAYER AND BUILT UP FORM IN A MOLD BODY, PROVIDING IN THE MOLD BODY A PASSAGE FOR A MOLTEN CASTING CHARGE OT THE EMBEDDED LAYER AND FORM, AND POURING INTO SAID PASSAGE A MOLTEN CASTING CHARGE FOR BURNING AND REPLACING SAID EMBEDDED FORM IN SAID MOLD BODY.
Claim 2
Independent Claim
174 words
A METHOD FOR MAKING LARGE PRECISION CASTINGS COMPRISING THE STEPS OF: MAKING AN IMPRESSION OF THE SURFACE OF A MODEL WITH A MATERIAL CAPABLE OF REPRESENTING SUCH SURFACE WITH A SMOOTH PRECISION FACING, COATING THE IMPRESSION WITH A LAYER OF REFRACTORY MATERIAL OF SUFFICIENT THICKNESS TO PROVIDE SUFFICIENT STRENGTH FOR MECHANICAL HANDLING WHEN FIRED, FIRING THE IMPRESSION AND THE REFRACTORY LAYER UNTIL THE REFRACTORY LAYER IS INERT AND THE IMPRESSION HAS DISINTEGRATED, BUILDING UP ON THE FACE OF THE REFRACTORY LAYER REPRESENTING THE IMPRESSION WITH A FORM COMBUSTIBLE SUBSTANTIALLY WITHOUT RESIDUE ON SUBJECTION TO A MOLTEN CASTING CHARGE AND SHAPED TO GIVE A DESIRED BODY AND BULK TO A CASTING HAVING A FORMING DEFINED BY THE FACE OF THE REFRACTORY LAYER REPRESENTING THE IMPRESSIONS, EMBEDDING THE REFRACTORY LAYER AND BUILT UP FORM IN A MOLD BODY, PROVIDING IN THE MOLD BODY A PASSAGE FOR A MOLTEN CASTING CHARGE OT THE EMBEDDED LAYER AND FORM, AND POURING INTO SAID PASSAGE A MOLTEN CASTING CHARGE FOR BURNING AND REPLACING SAID EMBEDDED FORM IN SAID MOLD BODY.
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) | 1971-07-23 | 1972-01-22 | 1972-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-23 | 1976-01-22 | 1976-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-23 | 1980-01-22 | 1980-07-23 | $7700.00 | Window Closed / Lapsed |