Patent US2811760A successfully refreshed from Google Patents.
US2811760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the production of casting moulds
Assignee: Shaw Process Dev Corp
•
Filing: 1954-03-08
•
Granted: 1957-11-05
•
Expires: 1974-03-08
Abstract
No abstract record available.
Inventors
- 👤 Shaw Clifford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:53
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
METHOD OF PRODUCING REFRACTORY MOULDS WHICH COMPRISES PREPARING AN AQUEOUS SLURRY COMPRISING A REFRACTORY FILLER AND AN INORGANIC NON-FLAMMABLE BINDER AND A GELLING ACCELERATOR, POURING SAID SLURRY OVER A PATTERN, ALLOWING THE SLURRY TO GEL, IMMEDIATELY SEPARATING THE GELLED MASS OF THE SLURRY FROM THE PATTERN, AND IMMEDIATELY HEATING THE GELLED MASS TO RAPIDLY DRIVE OFF WATER IN VAPOR FORM, THEREBY TO FIX THE EXTERNAL MOULD DIMENSIONS AND OBTAINING A MOULD HAVING AN INTERIOR STRUCTURE OF MICRO-CRACKS WHICH WILL NOT ALLOW CAST METAL TO FILL THE CRACK FORMATION, BUT WHICH WILL FACILITATE THE READY ESCAPE OF GASES DURING THE CASTING OF METAL.
Claim 2
Dependent Claim
102 words
METHOD OF PRODUCING REFRACTORY MOULDS WHICH COMPRISES PREPARING AN AQUEOUS SLURRY COMPRISING A REFRACTORY FILLER AND AN INORGANIC NON-FLAMMABLE BINDER AND A GELLING ACCELERATOR, POURING SAID SLURRY OVER A PATTERN, ALLOWING THE SLURRY TO GEL, IMMEDIATELY SEPARATING THE GELLED MASS OF THE SLURRY FROM THE PATTERN, AND IMMEDIATELY HEATING THE GELLED MASS TO RAPIDLY DRIVE OFF WATER IN VAPOR FORM, THEREBY TO FIX THE EXTERNAL MOULD DIMENSIONS AND OBTAINING A MOULD HAVING AN INTERIOR STRUCTURE OF MICRO-CRACKS WHICH WILL NOT ALLOW CAST METAL TO FILL THE CRACK FORMATION, BUT WHICH WILL FACILITATE THE READY ESCAPE OF GASES DURING THE CASTING OF METAL.
References Cited (Backward Citations)
US1981403A
Cited
US2380945A
Cited
US2388299A
Cited
US2441695A
Cited
US2496170A
Cited
US2518040A
Cited
US2652609A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-04 | 1961-05-06 | 1961-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-04 | 1965-05-06 | 1965-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-04 | 1969-05-06 | 1969-11-05 | $7700.00 | Window Closed / Lapsed |