US2889698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulated furnace wall
Assignee: Babcock and Wilcox Co
•
Filing: 1951-07-28
•
Granted: 1959-06-09
•
Expires: 1971-07-28
Abstract
No abstract record available.
Inventors
- 👤 William D Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:04
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/22; F24H1/40; F24H1/406; F22; F22B; F22B37/00; F22B37/02; F22B37/36; F23; F23M; F23M5/00; F23M5/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2000977A
Cited
US1996153A
Cited
US1909763A
Cited
US2073548A
Cited
US2368265A
Cited
US2282293A
Cited
US2536039A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-06-08 | 1962-12-08 | 1963-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-08 | 1966-12-08 | 1967-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-08 | 1970-12-08 | 1971-06-09 | $7700.00 | Window Closed / Lapsed |