US3607809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blast furnace taphole plugs
Assignee: Individual
•
Filing: 1967-08-01
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Granted: 1971-09-21
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Expires: 1987-08-01
Abstract
Abstract This invention relates to anhydrous plugs for stopping the tapholes of blast furnaces. This plug comprises, as a basic refractory material, a mixture consisting of low alumina pure silica and one or more refractory or gritty clays, and, as a binder, a resin or a plastic material containing a setting retarder such that the plug be heat stable at about 200* C.
Inventors
- 👤 Pierre Elby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:10
CPC Classifications
C; C21; C21B; C21B7/00; C21B7/12; C21B7/125
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
14 words
An anhydrous mass according to claim 1, in which the resin comprises a phenoplast.
Claim 2
Dependent Claim
14 words
An anhydrous mass according to claim 1, in which the resin comprises an aminoplast.
Claim 3
Dependent Claim
19 words
An anhydrous mass according to claim 1, in which the pH of said resin is between 6 and 7.4.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |