US3606722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory wall
Assignee: AP Green Refractories Co
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Filing: 1969-04-23
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Granted: 1971-09-21
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Expires: 1989-04-23
Abstract
Abstract A REFRACTORY WALL IS CONSTRUCTED FROM A PLURALITY OF PLASTIC BLOCKS LAID INTO MULTIPLE COURSES. MOST OF THE BLOCKS ARE FORMED ENTIRELY FROM A PLASTIC REFRACTORY MATERIAL, WHILE THE REMAINING BLOCKS ARE FORMED FROM THE SAME PLASTIC MATERIAL BUT HAVE NON-DEFORMABLE ANCHOR CORES EMBEDDED IN THEM. EACH ANCHOR CORE IS CREATED FROM A REFRACTORY MATERIAL WHICH DOES NOT IMPAIR THE REFRACTORINESS OF THE PLASTIC REFRACTORY MATERIAL.
Inventors
- 👤 William D Fitzpatrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:21
CPC Classifications
E; E04; E04F; E04F13/00; E04F13/07; E04F13/08; E04F13/0801; E04F13/0832; E04F13/0833; E04F13/0835; E04F13/0837; F; F27; F27D; F27D1/00; F27D1/14
Claims Analysis
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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 |