US2815552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a mold by the lost-wax process
Assignee: Metropolitan Vickers Electrical Co Ltd
•
Filing: 1952-11-10
•
Granted: 1957-12-10
•
Expires: 1972-11-10
Abstract
No abstract record available.
Inventors
- 👤 Turnbull John Stratton
- 👤 Nicholas Richard Glyn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:33
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/02; B22C9/04; B22C9/043
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
IN THE METHOD OF MAKING A SHELL SUITABLE FOR USE IN PRECISION CASTING; THE STEPS COMPRISING COATING A PATTERN OF AND OBJECT TO BE CAST WITH A POROUS REFRACTORY SHELL HAVING SUFFICIENT WALL THICKNESS TO PROVIDE A SELFSUPPORTING STRUCTURE AND SUFFICIENT POROSITY TO ALLOW VAPOR TO READILY PERMEATE THERETHROUGH TO SUBSTANTIALLY ALL SURFACES OF THE PATTERN; SUBSTANTIALLY COMPLETELY SURROUNDING SAID COATED PATTERN WITH A VAPOR ATMOSPHERE WHICH IS A SOLVENT TO THE PATTERN FOR A SUFFICIENT TIME TO ALLOW THE VAPOR TO PERMEATE THE SHELL WALL TO SURFACES OF THE PATTERN AND DISSOLVE THE PATTERN WHICH IS DRAINED FROM THE SHELL LEAVING THE INTERIOR THEREOF FREE FROM PATTERN RESIDUE.
Claim 2
Dependent Claim
109 words
IN THE METHOD OF MAKING A SHELL SUITABLE FOR USE IN PRECISION CASTING; THE STEPS COMPRISING COATING A PATTERN OF AND OBJECT TO BE CAST WITH A POROUS REFRACTORY SHELL HAVING SUFFICIENT WALL THICKNESS TO PROVIDE A SELFSUPPORTING STRUCTURE AND SUFFICIENT POROSITY TO ALLOW VAPOR TO READILY PERMEATE THERETHROUGH TO SUBSTANTIALLY ALL SURFACES OF THE PATTERN; SUBSTANTIALLY COMPLETELY SURROUNDING SAID COATED PATTERN WITH A VAPOR ATMOSPHERE WHICH IS A SOLVENT TO THE PATTERN FOR A SUFFICIENT TIME TO ALLOW THE VAPOR TO PERMEATE THE SHELL WALL TO SURFACES OF THE PATTERN AND DISSOLVE THE PATTERN WHICH IS DRAINED FROM THE SHELL LEAVING THE INTERIOR THEREOF FREE FROM PATTERN RESIDUE.
References Cited (Backward Citations)
US2420A
Cited
US162056A
Cited
US805144A
Cited
US1013666A
Cited
US1822285A
Cited
US1976009A
Cited
US2315394A
Cited
US2408005A
Cited
US2388299A
Cited
US2441695A
Cited
US2568364A
Cited
GB660604A
Cited
US2682092A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-09 | 1961-06-10 | 1961-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-09 | 1965-06-10 | 1965-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-09 | 1969-06-10 | 1969-12-10 | $7700.00 | Window Closed / Lapsed |