US2885976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Patching block for furnace roof
Assignee: Harbison Walker Refractories Co
•
Filing: 1957-06-25
•
Granted: 1959-05-12
•
Expires: 1977-06-25
Abstract
No abstract record available.
Inventors
- 👤 Lincoln A Mcgill
- 👤 Moore Richard Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:11
CPC Classifications
F; F27; F27D; F27D1/00; F27D1/04; F27D1/06; F27D1/08; F27D1/14; F27D1/145; F27D1/147; F27D1/148
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2143980A
Cited
US2725833A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-11 | 1962-11-10 | 1963-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-11 | 1966-11-10 | 1967-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-11 | 1970-11-10 | 1971-05-12 | $7700.00 | Window Closed / Lapsed |