Patent US3339622A successfully refreshed from Google Patents.
US3339622A
Expired / Lapsed
US
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Method of removing patterns from investment molds
Assignee: Precision Metalsmiths Inc
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Filing: 1965-05-26
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Granted: 1967-09-05
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Expires: 1985-05-26
Abstract
No abstract record available.
Inventors
- 👤 Robert A Horton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:18
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/02; B22C9/04; B22C9/043
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
88 words
IN A PROCESS OF INVESTMENT CASTING WHEREIN A REFRACTORY MOLD IS FORMED AROUND A PATTERN, A METHOD OF DESTROYING THE PATTERN WITHOUT CRACKING THE MOLD COMPRISING THE STEPS OF PLACING THE MOLD IN A FIRST MEDIUM WHICH IS A LIQUID AT A TEMPERATURE BELOW THAT WHICH WOULD CAUSE THE PATTERN TO EXPAND AND CRACK THE MOLD, PROVIDING A SECOND MEDIUM WHICH IS AT A TEMPERATURE HIGH ENOUGH TO MELT THE PATTERN, AND INCREMENTALLY MELTING THE PATTERN BY MOVING THE MOLD FROM THE FIRST MEDIUM INTO THE SECOND MEDIUM.
References Cited (Backward Citations)
US2759232A
Cited
US3010852A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-04 | 1971-03-06 | 1971-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-04 | 1975-03-06 | 1975-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-04 | 1979-03-06 | 1979-09-05 | $7700.00 | Window Closed / Lapsed |