Patent US3132388A successfully refreshed from Google Patents.
US3132388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing the pattern from a thin shell investment mold
Assignee: Corning Glass Works
•
Filing: 1959-08-26
•
Granted: 1964-05-12
•
Expires: 1979-08-26
Abstract
No abstract record available.
Inventors
- 👤 Nicholas J Grant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:35
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/02; B22C9/04; B22C9/043
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
THE METHOD OF REMOVING A WAXY PATTERN FROM A SHELL INVESTMENT MOLD FORMED THEREON, SAID MOLD HAVING A WALL THIN ENOUGH TO ALLOW RAPID TRANSFER OF EHAT THERETHROUGH AND NOT SUFFICIENTLY THICK TO RESIST BREAKAGE FROM THE FORCE WHICH WOULD RESULT FROM EXPANSION OF SAID WAX PATTERN UPON SLOW HEATING THEREOF, WHICH COMPRISES EXPOSING THE MOLD AND PATTEN TO A SURROUNDING ATMOSPHERE CONSISTING ESSENTIALLY OF INERT GAS MAINTAINED AT A TEMPERATURE AT LEAST 250*C. IN EXCESS OF THE MELTING POINT OF THE WAX TO LIQUEFY THE WAX AT ITS INTERFACE WITH THE MOLD BEFORE THE OVERALL TEMPERATURE OF THE WAX BODY HAS SUBSTANTIALLY INCREASED AND CONTINUING THE HEATING OF THE MOLD UNTIL THE WAX IS COMPLETELY REMOVED.
Claim 2
Independent Claim
117 words
THE METHOD OF REMOVING A WAXY PATTERN FROM A SHELL INVESTMENT MOLD FORMED THEREON, SAID MOLD HAVING A WALL THIN ENOUGH TO ALLOW RAPID TRANSFER OF EHAT THERETHROUGH AND NOT SUFFICIENTLY THICK TO RESIST BREAKAGE FROM THE FORCE WHICH WOULD RESULT FROM EXPANSION OF SAID WAX PATTERN UPON SLOW HEATING THEREOF, WHICH COMPRISES EXPOSING THE MOLD AND PATTEN TO A SURROUNDING ATMOSPHERE CONSISTING ESSENTIALLY OF INERT GAS MAINTAINED AT A TEMPERATURE AT LEAST 250*C. IN EXCESS OF THE MELTING POINT OF THE WAX TO LIQUEFY THE WAX AT ITS INTERFACE WITH THE MOLD BEFORE THE OVERALL TEMPERATURE OF THE WAX BODY HAS SUBSTANTIALLY INCREASED AND CONTINUING THE HEATING OF THE MOLD UNTIL THE WAX IS COMPLETELY REMOVED.
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) | 1967-05-12 | 1967-11-11 | 1968-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-12 | 1971-11-11 | 1972-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-12 | 1975-11-11 | 1976-05-12 | $7700.00 | Window Closed / Lapsed |