Patent US4425191A successfully refreshed from Google Patents.
US4425191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for minimizing leakage from heated chambers and method for making same
Assignee: Silicon Technology Inc
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Filing: 1981-09-11
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Granted: 1984-01-10
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Expires: 2001-09-11
Abstract
Abstract A heated chamber having at least one opening; closure means for closing said at least one opening, said closure means having at least a closed and open position; said closure means and said opening having surfaces disposed for coming into proximity of one another in said closed position, said surfaces forming a primary sealing means for said heated chamber in said closed position, there being a substance applied to at least one of said proximate surfaces, said substance having a property of expanding upon the application of heat thereby forming a secondary sealing means between said proximate surfaces in said closed position.
Inventors
- 👤 Joseph M. Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:05
CPC Classifications
C; C10; C10B; C10B25/00; C10B25/02; C10B25/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
122 words
A heated chamber having at least one opening, closure means for closing said at least one opening, said closure means at least a closed and open position, said closure means and said opening having surfaces disposed for coming into proximity of one another in said closed position, said surfaces forming a primary sealing means for said heated chamber in said closed position, there being a substance applied to at least one of said proximate surfaces, said substance being an intumescent substance which foams and expands upon the application of heat, thereby forming a secondary sealing means between said proximate surfaces in said closed position, when said substance is in a foamed and expanded condition, said substance consisting essentially of a liquid silicate.
Claim 2
Dependent Claim
122 words
A heated chamber having at least one opening, closure means for closing said at least one opening, said closure means at least a closed and open position, said closure means and said opening having surfaces disposed for coming into proximity of one another in said closed position, said surfaces forming a primary sealing means for said heated chamber in said closed position, there being a substance applied to at least one of said proximate surfaces, said substance being an intumescent substance which foams and expands upon the application of heat, thereby forming a secondary sealing means between said proximate surfaces in said closed position, when said substance is in a foamed and expanded condition, said substance consisting essentially of a liquid silicate.
Claim 3
Dependent Claim
20 words
A heated chamber according to claim 1, wherein said substance, when applied, has a viscosity between 400 and 950 centipoise.
Claim 4
Dependent Claim
15 words
A heated chamber according to claim 1, wherein said heated chamber is a coke oven.
Claim 5
Independent Claim
78 words
A method of sealing a heated chamber having at least one opening with closure means therefor, said closure means forming a primary sealing means for said chamber, comprising the steps of: applying an intumescent substance which foams and expands upon heating, to at least one surface between said at least one opening and said closure means, said substance on foaming and expanding, forming a secondary sealing means for said chamber, said substance consisting essentially of a liquid silicate.
Claim 6
Independent Claim
78 words
A method of sealing a heated chamber having at least one opening with closure means therefor, said closure means forming a primary sealing means for said chamber, comprising the steps of: applying an intumescent substance which foams and expands upon heating, to at least one surface between said at least one opening and said closure means, said substance on foaming and expanding, forming a secondary sealing means for said chamber, said substance consisting essentially of a liquid silicate.
Claim 7
Dependent Claim
27 words
A method as claimed in claim 4, wherein said substance is applied to said surface with the temperature of said surface being at or above 100° C.
Claim 8
Dependent Claim
24 words
A method as claimed in claim 4, wherein said applying is accomplished by spraying or trowelling the substance onto said at least one surface.
Claim 9
Dependent Claim
20 words
A method as claimed in claim 4, wherein said substance is applied at a viscosity between 400 and 950 centipoise.
Claim 10
Dependent Claim
25 words
A method as claimed in claim 7, wherein said substance is applied as a layer between 10 and 20 thousandths of an inch in thickness.
Claim 11
Dependent Claim
15 words
A method as claimed in claim 4, wherein said heated chamber is a coke oven.
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) | 1987-01-09 | 1987-07-11 | 1988-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-09 | 1991-07-11 | 1992-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-09 | 1995-07-11 | 1996-01-10 | $7700.00 | Window Closed / Lapsed |