US2886869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Graphite refractory molds and method of making same
Assignee: Individual
•
Filing: 1956-08-01
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Granted: 1959-05-19
•
Expires: 1976-08-01
Abstract
No abstract record available.
Inventors
- 👤 John M Webb
- 👤 Kazenas Zenon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:37
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A METHOD OF CASTING CHEMICALLY ACTIVE METALS AND ALLOYS COMPRISING THE STEPS OF PREPARING A MOLD FROM A SOLID PATTERN BY DIPPING THE PATTERN INTO A SLURRY CON SISTING OF A REFRACTORY COMPOSITION OF GRAPHITE PARTICLES OF 35 TO 400 MESH, 10 TO 50 PARTS BY WEIGHT OF A HIGH MELTING PITCH AND .25 TO 10 PARTS BY WEIGHT OF A LOW TEMPERATURE BINDER IN A CARRIER TO BUILD UP A PLURALITY OF THIN LAYERS TO FORM A THIN-WALLED MOLD, MELTING OUT THE PATTERN, HEATING THE MOLD UNDER NON-OXIDIZING CONDITIONS
Claim 2
Independent Claim
90 words
A METHOD OF CASTING CHEMICALLY ACTIVE METALS AND ALLOYS COMPRISING THE STEPS OF PREPARING A MOLD FROM A SOLID PATTERN BY DIPPING THE PATTERN INTO A SLURRY CON SISTING OF A REFRACTORY COMPOSITION OF GRAPHITE PARTICLES OF 35 TO 400 MESH, 10 TO 50 PARTS BY WEIGHT OF A HIGH MELTING PITCH AND .25 TO 10 PARTS BY WEIGHT OF A LOW TEMPERATURE BINDER IN A CARRIER TO BUILD UP A PLURALITY OF THIN LAYERS TO FORM A THIN-WALLED MOLD, MELTING OUT THE PATTERN, HEATING THE MOLD UNDER NON-OXIDIZING CONDITIONS
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) | 1962-05-18 | 1962-11-17 | 1963-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-18 | 1966-11-17 | 1967-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-18 | 1970-11-17 | 1971-05-19 | $7700.00 | Window Closed / Lapsed |