Patent US2316703A successfully refreshed from Google Patents.
Patent US2731690A successfully refreshed from Google Patents.
US2731690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the manufacture of centrifugally cast tubular metal articles
Assignee: American Cast Iron Pipe Co
•
Filing: 1954-07-29
•
Granted: 1956-01-24
•
Expires: 1974-07-29
Abstract
No abstract record available.
Inventors
- 👤 Jr Frank H Coupland
- 👤 Edwin H Phelps
- 👤 John M Cranford
- 👤 Kenneth R Daniel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:32
CPC Classifications
B; B22; B22D; B22D13/00; B22D13/10; B22D13/108; B22D13/101
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
72 words
A METHOD OF CENTRIFUGALLY CASTIN TUBULAR METAL ARTICLES OF THE TYPE WHEREIN A CHARGE OF MOLTEN METAL IS INTRODUCED INTO A REFRACTORY LINED METAL MOLD WHILE THE MOLD IS ROTATING ABOUT A SUBSTANTIALLY HORIZONTAL AXIS, CHARACTERIZED BY THE STEPS OF PROVIDING A ROTATABLE HOLLOW METAL MOLD HAVING VENTS IN THE WALL THEREOF, AND LINING SAID MOLD WITH A MATERIAL COMPOSED OF A GRANULAR REFRACTORY AND A THERMOSETTING RESIN WHILE ROTATING SAID MOLD
References Cited (Backward Citations)
US359483A
Cited
US2449136A
Cited
US1620830A
Cited
US2239530A
Cited
US2289681A
Cited
US2245747A
Cited
US2344020A
Cited
US2294935A
Cited
US2399606A
Cited
US2450755A
Cited
US2559161A
Cited
US2518055A
Cited
US2631342A
Cited
US2598554A
Cited
US2623809A
Cited
US2645558A
Cited
US2663921A
Cited
US2689990A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-23 | 1959-07-25 | 1960-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-23 | 1963-07-25 | 1964-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-23 | 1967-07-25 | 1968-01-24 | $7700.00 | Window Closed / Lapsed |