Patent US4796182A successfully refreshed from Google Patents.
Patent US3177537A successfully refreshed from Google Patents.
US3177537A
Expired / Lapsed
US
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Methods and apparatus for forming investment molds and mold produced thereby
Assignee: Precision Metalsmiths Inc
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Filing: 1962-12-27
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Granted: 1965-04-13
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Expires: 1982-12-27
Abstract
No abstract record available.
Inventors
- 👤 Robert A Horton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:04
CPC Classifications
B; B22; B22C; B22C7/00; B22C7/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
64 words
A SHELL MOLD ASSEMBLY COMPRISING A HOLLOW METAL FORM, SAID FORM HAVING WAX COATING ONTHE OUTER SURFACE THEREOF, SAID COATING HAVING A THICKNESS OF ABOUT ONESIXTEENTH OF AN INCH, AT LEAST ONE PATTERN FORMED OF AN EXPENDABLE MATERIAL, SAID PATTERN HAVING A PORTION THEREOF EMBEDDED IN SAID WAX, AND A REFRACTORY SHELL MOLD SUITABLE FOR CASTING METAL SURROUNDING SAID PATTERN AND SAID WAXCOATED FORM.
Claim 2
Dependent Claim
64 words
A SHELL MOLD ASSEMBLY COMPRISING A HOLLOW METAL FORM, SAID FORM HAVING WAX COATING ONTHE OUTER SURFACE THEREOF, SAID COATING HAVING A THICKNESS OF ABOUT ONESIXTEENTH OF AN INCH, AT LEAST ONE PATTERN FORMED OF AN EXPENDABLE MATERIAL, SAID PATTERN HAVING A PORTION THEREOF EMBEDDED IN SAID WAX, AND A REFRACTORY SHELL MOLD SUITABLE FOR CASTING METAL SURROUNDING SAID PATTERN AND SAID WAXCOATED FORM.
Claim 3
Dependent Claim
75 words
A PROCESS OF PRODUCILNG A REFRACTORY MOLD COMPRISING THE STEPS OF PROVIDING A METAL FORM, COATING SAID METAL FORM WITH A HEAT-DISPOSABLE MATERIAL, ATTACHING TO SAID COATING A PORTION OF AN EXPENDABLE PATTERN, FORMING A REFRACTORY MOLD AROUND SAID COATED METAL FORM AND SAID PATTERN, HEATING SAID METAL FORM TO MELT SAID COATING AND THEN SLIDING THE FORM FROM SAID MOLD, WHEREBY SAID PATTERN PORTION IS EXPOSED, AND THEREAFTER REMOVING SAID PATTERN FROM SAID MOLD.
Claim 4
Dependent Claim
75 words
A PROCESS OF PRODUCILNG A REFRACTORY MOLD COMPRISING THE STEPS OF PROVIDING A METAL FORM, COATING SAID METAL FORM WITH A HEAT-DISPOSABLE MATERIAL, ATTACHING TO SAID COATING A PORTION OF AN EXPENDABLE PATTERN, FORMING A REFRACTORY MOLD AROUND SAID COATED METAL FORM AND SAID PATTERN, HEATING SAID METAL FORM TO MELT SAID COATING AND THEN SLIDING THE FORM FROM SAID MOLD, WHEREBY SAID PATTERN PORTION IS EXPOSED, AND THEREAFTER REMOVING SAID PATTERN FROM SAID MOLD.
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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) | 1968-04-12 | 1968-10-12 | 1969-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-12 | 1972-10-12 | 1973-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-12 | 1976-10-12 | 1977-04-13 | $7700.00 | Window Closed / Lapsed |