Patent US2795022A successfully refreshed from Google Patents.
US2795022A
Expired / Lapsed
US
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Method of making moulds
Assignee: Shaw Process Dev Corp
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Filing: 1953-04-09
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Granted: 1957-06-11
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Expires: 1973-04-09
Abstract
No abstract record available.
Inventors
- 👤 Shaw Noel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:41
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/205
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A METHOD OF PRODUCING REFRACTORY MOULDS WHICH COMPRISES PREPARING A SLURRY COMPRISING COMMINUTED REFRACTORY MATERIALS AND A BINDER OF A LIQUID LOWER ALKYL SILICATE, WATER 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 THEREAFTER IGNITING THE SURFACES OF THE GELLED MASS AND ALLOWING THE INTENSE FLAMES, RESULTING FROM SAID IGNITION TO BURN UNTIL THE FLAMMABLES ARE CONSUMED, THEREBY FREEZING THE MOULD DIMENSIONS AND OBTAINING A MOULD HAVING A POROUS STRUCTURE OF MICROCRACKS WHICH WILL NOT ALLOW CAST METAL TO FILL THE CRACK FORMATION BUT WHICH WILL FACILITATE THE READY ESCAPE OF GASES DURING POURING.
Claim 2
Independent Claim
114 words
A METHOD OF PRODUCING REFRACTORY MOULDS WHICH COMPRISES PREPARING A SLURRY COMPRISING COMMINUTED REFRACTORY MATERIALS AND A BINDER OF A LIQUID LOWER ALKYL SILICATE, WATER 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 THEREAFTER IGNITING THE SURFACES OF THE GELLED MASS AND ALLOWING THE INTENSE FLAMES, RESULTING FROM SAID IGNITION TO BURN UNTIL THE FLAMMABLES ARE CONSUMED, THEREBY FREEZING THE MOULD DIMENSIONS AND OBTAINING A MOULD HAVING A POROUS STRUCTURE OF MICROCRACKS WHICH WILL NOT ALLOW CAST METAL TO FILL THE CRACK FORMATION BUT WHICH WILL FACILITATE THE READY ESCAPE OF GASES DURING POURING.
References Cited (Backward Citations)
US1909008A
Cited
US2027932A
Cited
US2388299A
Cited
US2496170A
Cited
US2491096A
Cited
AT183874B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-06-10 | 1960-12-10 | 1961-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-10 | 1964-12-10 | 1965-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-10 | 1968-12-10 | 1969-06-11 | $7700.00 | Window Closed / Lapsed |