Patent US3800716A successfully refreshed from Google Patents.
US3800716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace closure
Assignee: Individual
•
Filing: 1973-02-16
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Granted: 1974-04-02
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Expires: 1993-02-16
Abstract
Abstract A closure for a high-temperature furnace such as a muffle kiln is disclosed. The closure is formed of a hollow, elongated member, the rearward end of which supports a high-temperature resistant window such as a quartz panel, and the forward end of which forms a closure seal with the outer surface of the muffle while permitting visual monitoring of the interior of the furnace. The recess of the window decreases the effective volume of the furnace which permits more rapid heating of the furnace to processing temperature and more even control of the furnace at peak temperature.
Inventors
- 👤 R Berger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:44
CPC Classifications
F; F23; F23M; F23M7/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
112 words
A closure for a high-temperature furnace having an elongated furnace chamber comprising: an annular, front lip section adapted to overlap the opening of said furnace chamber; an elongated, hollow tunnel section having a length of at least one-third and no more than three-fourths the length of said furnace chamber having a rearward end adapted to be slidingly received within said chamber and having a forward end sealingly attached to said lip section and adapted to abut the front face of the opening to said chamber; and frame means formed adjacent said rearward end for receiving a transparent panel, said closure being Formed of refractory material capable of withstanding a temperture of 3,000*F.
Claim 2
Dependent Claim
112 words
A closure for a high-temperature furnace having an elongated furnace chamber comprising: an annular, front lip section adapted to overlap the opening of said furnace chamber; an elongated, hollow tunnel section having a length of at least one-third and no more than three-fourths the length of said furnace chamber having a rearward end adapted to be slidingly received within said chamber and having a forward end sealingly attached to said lip section and adapted to abut the front face of the opening to said chamber; and frame means formed adjacent said rearward end for receiving a transparent panel, said closure being Formed of refractory material capable of withstanding a temperture of 3,000*F.
Claim 3
Dependent Claim
43 words
A closure according to claim 1 in which said chamber has a rectangular cross section, and the outer surface of said tunnel section has a correspondingly configured rectangular cross-section formed of a pair of side walls, a bottom wall and a top wall.
Claim 4
Dependent Claim
33 words
A closure in accordance with claim 1 in which the length of said tunnel section is at least one-half and no more than three-fourths the length of the length of said furnace chamber.
Claim 5
Dependent Claim
63 words
A closure according to claim 2 in which said frame means comprises a set of opposing grooves formed in the interior surface of the side and bottom walls, a groove in the bottom wall joining said side wall grooves and a slot in the top wall joining the upper ends of said side wall grooves forming a frame for slidingly receiving said panel.
Claim 6
Dependent Claim
14 words
A closure according to claim 5 in which said panel is formed of quartz.
Claim 7
Dependent Claim
85 words
A closure for a high-temperature furnace having an elongated furnace chamber comprising: an annular, front lip section adapted to overlap the opening of said furnace chamber; an elongated, hollow tunnel section having a rearward end adapted to be slidingly received within said chamber and having a forward end sealingly attached to said lip section and adapted to abut the front face of the opening to said chamber; frame means formed adjacent said rearward end for receiving a transparent panel; and means for gripping said closure.
Claim 8
Dependent Claim
85 words
A closure for a high-temperature furnace having an elongated furnace chamber comprising: an annular, front lip section adapted to overlap the opening of said furnace chamber; an elongated, hollow tunnel section having a rearward end adapted to be slidingly received within said chamber and having a forward end sealingly attached to said lip section and adapted to abut the front face of the opening to said chamber; frame means formed adjacent said rearward end for receiving a transparent panel; and means for gripping said closure.
Claim 9
Dependent Claim
45 words
A closure according to claim 6 in which the gripping means includes a recess formed adjacent an edge of the inner opening of the front lip forming between said edge and the recess a gripping bar for engagement with a clamp of a carrying tool.
Claim 10
Dependent Claim
31 words
A closure according to claim 6 in which a cutout is formed in said edge portion opposite said recess for securing said clamp from sideward movement when engaging said gripping bar.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |