US3381947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace vestibule having a movable ceiling
Assignee: Midland Ross Corp
•
Filing: 1965-09-20
•
Granted: 1968-05-07
•
Expires: 1985-09-20
Abstract
No abstract record available.
Inventors
- 👤 Beggs Donald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:01
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/74
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1431289A
Cited
US1371800A
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US1876960A
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CH144921A
Cited
US2033398A
Cited
US2262252A
Cited
US2231635A
Cited
US2440065A
Cited
US2441803A
Cited
US2589811A
Cited
US2752147A
Cited
US2776134A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-07 | 1971-11-06 | 1972-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-07 | 1975-11-06 | 1976-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-07 | 1979-11-06 | 1980-05-07 | $7700.00 | Window Closed / Lapsed |