US3410544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace muffle
Assignee: BTU Engineering Corp
•
Filing: 1966-10-03
•
Granted: 1968-11-12
•
Expires: 1986-10-03
Abstract
No abstract record available.
Inventors
- 👤 Beck Jacob Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:53
CPC Classifications
F; F27; F27B; F27B9/00; F27B9/06; F27B9/08; F27B9/082; C; C21; C21D; C21D9/00; C21D9/0043; F27B9/04; F27B9/045; F27B9/047; F27D; F27D9/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US833640A
Cited
US1782234A
Cited
US2391997A
Cited
US2602653A
Cited
US3058861A
Cited
US3160403A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-12 | 1972-05-13 | 1972-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-12 | 1976-05-13 | 1976-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-12 | 1980-05-13 | 1980-11-12 | $7700.00 | Window Closed / Lapsed |