US2539408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molding composition and method of making same
Assignee: Ford Motor Co
•
Filing: 1948-06-11
•
Granted: 1951-01-30
•
Expires: 1968-06-11
Abstract
No abstract record available.
Inventors
- 👤 Ensign Elbert Edwin
- 👤 Royal Arch Van Patten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:31
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/18
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
62 words
THE PROCESS OF PREPARING A MOLDING MATERIAL COMPRISING EXPOSING A MIXTURE OF SILICA FLOUR AND A HYDRATE A CALCIUM SULPHATE TO HEAT SUFFICIENT TO CAUSE AT LEAST A PARTIAL REACTION, PULVERIZING THE MIXTURE SO TREATED TO A PARTICLE SIZE COMPARABLE TO THAT THE ORIGINAL SILICA FLOUR AND ADDING TO THE SAID MIXTURE FRESH UNREACTED SILICA FLOUR AND THE HEMIHYDRATE OF CALCIUM SULPHATE.
References Cited (Backward Citations)
US661247A
Cited
US1901052A
Cited
US2220703A
Cited
US2391855A
Cited
US2322638A
Cited
US2425891A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-29 | 1954-07-31 | 1955-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-29 | 1958-07-31 | 1959-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-29 | 1962-07-31 | 1963-01-30 | $7700.00 | Window Closed / Lapsed |