US3148422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of shell moulds
Assignee: Monsanto Chemicals Ltd
•
Filing: 1962-07-10
•
Granted: 1964-09-15
•
Expires: 1982-07-10
Abstract
No abstract record available.
Inventors
- 👤 Payne John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:41
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/02; B22C9/04; B22C9/043; B22C7/00; B22C7/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A PROCESS FOR THE PRODUCTION OF A REFRACTORY SHELL MOULD, IN WHICH A SUITABLE REFRACTORY COATING IS APPLIED TO A WAX PATTERN AND THE WHOLE COATED PATTERN AT AN INITIAL TEMPERATURE OF NOT MORE THAN AOVUT 50*C. IS EXPOSED TO AN ATMOSPHERE OF STEAM UNDER PRESSURE OF FROM ABOUT 20 TO ABOUT 150 POUNDS PER SQUARE INCH WHEREBY THE WAX IS MELTED WITHOUT CRACKING THE SHELL MOULD.
Claim 2
Dependent Claim
67 words
A PROCESS FOR THE PRODUCTION OF A REFRACTORY SHELL MOULD, IN WHICH A SUITABLE REFRACTORY COATING IS APPLIED TO A WAX PATTERN AND THE WHOLE COATED PATTERN AT AN INITIAL TEMPERATURE OF NOT MORE THAN AOVUT 50*C. IS EXPOSED TO AN ATMOSPHERE OF STEAM UNDER PRESSURE OF FROM ABOUT 20 TO ABOUT 150 POUNDS PER SQUARE INCH WHEREBY THE WAX IS MELTED WITHOUT CRACKING THE SHELL MOULD.
References Cited (Backward Citations)
US1822285A
Cited
US2815552A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-15 | 1968-03-16 | 1968-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-15 | 1972-03-16 | 1972-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-15 | 1976-03-16 | 1976-09-15 | $7700.00 | Window Closed / Lapsed |