Patent US3216688A successfully refreshed from Google Patents.
US3216688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot top with dead air space
Assignee: Individual
•
Filing: 1963-01-24
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Granted: 1965-11-09
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Expires: 1983-01-24
Abstract
No abstract record available.
Inventors
- 👤 Robert E Daley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:25
CPC Classifications
B; B22; B22D; B22D7/00; B22D7/06; B22D7/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
110 words
A HOT TOP COMPRISING A METAL CASING PROVIDED WITH A CENTRAL VERTICAL PASSAGE THERETHROUGH FOR MOLTEN METAL AND WITH AN INWARDLY PROJECTING FLANGE AT ITS UPPER END, A REFRACTORY LINING IN THE CASING, SEPARATE UPRIGHT INSULATING PANELS BENEATH SAID FLANGE AND SPACED INWARDLY FROM THE LINING WITH THEIR UPPER ENDS CLOSE TO THE BOTTOM OF SAID FLANGE, AND A REFRACTORY BOTTOM RING BENEATH SAID CASING AND ATTACHED THERETO, SAID RING PROJECTING INWARD BENEATH SAID PANELS AND SUPPORTING THEM, WHEREBY DEAD AIR SPACE IS CREATED BETWEEN SAID LINING AND PANELS THE BOTTOM RING BEING PROVIDED WITH A TOP RIB PROJECTING UP INTO SAID AIR SPACE SUBSTANTIALLY IN ENGAGEMENT WITH THE PANELS.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |