US3343829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous plug assembly for metallurgical receptacle
Assignee: British Cast Iron Research Association
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Filing: 1965-03-15
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Granted: 1967-09-26
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Expires: 1985-03-15
Abstract
No abstract record available.
Inventors
- 👤 Roderick B Coates
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 01:50
CPC Classifications
F; F27; F27D; F27D3/00; F27D3/15; F27D3/1509; F27D3/1536; B; B22; B22D; B22D1/00; B22D1/002; B22D1/005; F27B; F27B5/00; F27B5/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
71 words
A TAPERED FURSTO-CONICAL GAS-PERMEABLE PLUG FOR INSERTION IN A FRUSTO-CONICAL HOLE IN A WALL OF A REFRACTORY LINED CONTAINER FOR THE ADMISSION OF GAS INTO MOLTEN METAL IN THE CONTAINER, SAID PLUG COMPRISING AN OUTER NONPERMEABLE SHELL OR REFRACTORY MATERIAL HAVING A SMOOTH TAPERED FRUSTO-CONICAL EXTERNAL SURFACE FOR REMOVABLE ENGAGEMENT IN SAID FRUSTO-CONICAL HOLE IN SAID CONTAINER WALL AND AN INNER GAS-PERMEABLE CORE OF REFRACTORY MATERIAL REMOVABLY RECEIVED IN SAIDS SHELL.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-25 | 1971-03-27 | 1971-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-25 | 1975-03-27 | 1975-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-25 | 1979-03-27 | 1979-09-26 | $7700.00 | Window Closed / Lapsed |