Patent US3222738A successfully refreshed from Google Patents.
US3222738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of removing expendable plastic patterns
Assignee: Individual
•
Filing: 1963-04-18
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Granted: 1965-12-14
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Expires: 1983-04-18
Abstract
No abstract record available.
Inventors
- 👤 Richard T Carter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:12
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/02; B22C9/04; B22C9/043
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
A METHOD OF REMOVING AN EXPANDABLE PATTERN OF A HEAT SOFTENABLE WAX MATERIAL FROM A SHELL MOLD COMPRISING IMMERSING SAID MOLD CONTAINING SAID PATTERN IN A FLUIDIZED PARTICULATE MATERIAL AT A FLUIDIZING GAS TEMPERATURE GREATER THAN 350*F. TO SOFTEN SAID PATTERN WITHIN ONE MINUTE WITHOUT DAMAGING SAID SHELL.
Claim 2
Independent Claim
48 words
A METHOD OF REMOVING AN EXPANDABLE PATTERN OF A HEAT SOFTENABLE WAX MATERIAL FROM A SHELL MOLD COMPRISING IMMERSING SAID MOLD CONTAINING SAID PATTERN IN A FLUIDIZED PARTICULATE MATERIAL AT A FLUIDIZING GAS TEMPERATURE GREATER THAN 350*F. TO SOFTEN SAID PATTERN WITHIN ONE MINUTE WITHOUT DAMAGING SAID SHELL.
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) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |