US3256574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mold and method of fabrication
Assignee: Howmet Turbine Components Corp
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Filing: 1965-03-22
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Granted: 1966-06-21
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Expires: 1985-03-22
Abstract
No abstract record available.
Inventors
- 👤 Nick G Lirones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:33
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/165; B22C9/00; B22C9/02; B22C9/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
IN THE METHOD OF PRODUCING A MOLD FOR USE IN METAL CASTING IN WHICH THE MOLD IS FORMED AT LEAST IN THE INNER SURFACES ABOUT THE MOLD CAVITY OF GRAPHITIC MATERIAL CONSISTING OF GRAPHITE AND GRAPHITE STUCCO, THE IMPROVEMENT COMPRISING THE STEPS OF IMPREGNATING THE MOLD SURFACES WITH A DILUTE FLUID COMPOSITION CONTAINING AN ORGANIC RESINOUS MATERIAL WHICH IS REDUCIBLE TO A CARBONACEOUS MATERIAL UPON THERMAL DECOMPOSITION AT ELEVATED TEMPERATURE, AND THEN FIRING THE MOLD IN A NON-OXIDIZING ATMOSPHERE TO A TEMPERATURE ABOVE DECOMPOSITION TEMPERATURE FOR THE ORGANIC RESINOUS MATERIAL THEREMALLY TO DECOMPOSE THE RESIN IN SITU IN THE IMPREGNATED MOLD.
Claim 2
Dependent Claim
101 words
IN THE METHOD OF PRODUCING A MOLD FOR USE IN METAL CASTING IN WHICH THE MOLD IS FORMED AT LEAST IN THE INNER SURFACES ABOUT THE MOLD CAVITY OF GRAPHITIC MATERIAL CONSISTING OF GRAPHITE AND GRAPHITE STUCCO, THE IMPROVEMENT COMPRISING THE STEPS OF IMPREGNATING THE MOLD SURFACES WITH A DILUTE FLUID COMPOSITION CONTAINING AN ORGANIC RESINOUS MATERIAL WHICH IS REDUCIBLE TO A CARBONACEOUS MATERIAL UPON THERMAL DECOMPOSITION AT ELEVATED TEMPERATURE, AND THEN FIRING THE MOLD IN A NON-OXIDIZING ATMOSPHERE TO A TEMPERATURE ABOVE DECOMPOSITION TEMPERATURE FOR THE ORGANIC RESINOUS MATERIAL THEREMALLY TO DECOMPOSE THE RESIN IN SITU IN THE IMPREGNATED MOLD.
References Cited (Backward Citations)
US2564308A
Cited
US2886869A
Cited
US3005244A
Cited
US3010852A
Cited
US3153825A
Cited
US3153826A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-06-20 | 1969-12-20 | 1970-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-20 | 1973-12-20 | 1974-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-20 | 1977-12-20 | 1978-06-21 | $7700.00 | Window Closed / Lapsed |