Patent US3212466A successfully refreshed from Google Patents.
US3212466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roof-jack for a metallurgical furnace
Assignee: United States Steel Corp
•
Filing: 1963-01-07
•
Granted: 1965-10-19
•
Expires: 1983-01-07
Abstract
No abstract record available.
Inventors
- 👤 John C Wintersteen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:02
CPC Classifications
F; F27; F27D; F27D1/00; F27D1/02; F27D1/021; F23; F23M; F23M5/00; F23M5/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
THE COMBINATION WITH AN ARCHED FURNACE ROOF AND AN OVERHEAD STRUCTURAL FRAMEWORK EXTENDING TRANSVERSELY THEREABOVE, OF A PLURALITY OF JACKS CONNECTED TO SAID FRAMEWORK AND BEARING DOWNWARDLY ON SAID ROOF, EACH JACK COMPRISING AN EXTENSIBLE POST AND A PRE-LOADED SPRING CUSHION ALINED WITH THE POST, EACH OF SAID JACKS BEING DISPOSED IN SUBSTANTIALLY UPRIGHT POSITION BETWEEN OVERHEAD FRAMEWORK AND SAID ROOF WHEREBY SAID PRELOADED SPRING CUSHIONS EXERT FORCE PRESSING DOWN ON SAID ROOF FROM SAID OVERHEAD FRAMEWORK.
Claim 2
Dependent Claim
77 words
THE COMBINATION WITH AN ARCHED FURNACE ROOF AND AN OVERHEAD STRUCTURAL FRAMEWORK EXTENDING TRANSVERSELY THEREABOVE, OF A PLURALITY OF JACKS CONNECTED TO SAID FRAMEWORK AND BEARING DOWNWARDLY ON SAID ROOF, EACH JACK COMPRISING AN EXTENSIBLE POST AND A PRE-LOADED SPRING CUSHION ALINED WITH THE POST, EACH OF SAID JACKS BEING DISPOSED IN SUBSTANTIALLY UPRIGHT POSITION BETWEEN OVERHEAD FRAMEWORK AND SAID ROOF WHEREBY SAID PRELOADED SPRING CUSHIONS EXERT FORCE PRESSING DOWN ON SAID ROOF FROM SAID OVERHEAD FRAMEWORK.
References Cited (Backward Citations)
US1128996A
Cited
US1245433A
Cited
US1574946A
Cited
US1506820A
Cited
US2222978A
Cited
US2659326A
Cited
GB676066A
Cited
US2698588A
Cited
US2908491A
Cited
US3071528A
Cited
US3015288A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-18 | 1969-04-19 | 1969-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-18 | 1973-04-19 | 1973-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-18 | 1977-04-19 | 1977-10-19 | $7700.00 | Window Closed / Lapsed |