US4840131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulating linings for furnaces and kilns
Assignee: Foseco International Ltd
•
Filing: 1987-09-08
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Granted: 1989-06-20
•
Expires: 2007-09-08
Abstract
Abstract A furnace or kiln for use in the heat treatment of materials or articles has an inner lining comprising boards (2, l8, 29) of refractory, heat-insulating material restrained from inward movement by means of rails (l, l7, 33) of refractory, heat-insulating material having shoulders at their inward side against the back of which shoulders edge portions of the boards (2, l8, 29) rest.
Inventors
- 👤 Henry R. Meumann
- 👤 Johannes Stark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:50
CPC Classifications
F; F27; F27D; F27D1/00; F27D1/0003; F27D1/0006; F27D1/0009
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
95 words
A furnace or kiln for the heat treatment of materials or articles, said furnace or kiln having an inner lining comprising boards of refractory, heat-insulating material where said boards are restrained from inward movement by rails of a ceramic fiber-based refractory heat-insulating material having shoulders at their inward side against the back of which shoulders edge portions of said boards rest, the thermal conductivity of said rails being not greater than 0.1 w.M -1 . °K -1 at ambient temperature, the rails having a density within the range of 0.2 to 0.75 g.cm -3 .
Claim 2
Dependent Claim
95 words
A furnace or kiln for the heat treatment of materials or articles, said furnace or kiln having an inner lining comprising boards of refractory, heat-insulating material where said boards are restrained from inward movement by rails of a ceramic fiber-based refractory heat-insulating material having shoulders at their inward side against the back of which shoulders edge portions of said boards rest, the thermal conductivity of said rails being not greater than 0.1 w.M -1 . °K -1 at ambient temperature, the rails having a density within the range of 0.2 to 0.75 g.cm -3 .
Claim 3
Dependent Claim
22 words
A furnace or kiln according to claim 1 wherein the density of the rails is greater than the density of the boards.
Claim 4
Dependent Claim
20 words
A furnace or kiln according to claim 1 wherein the boards are formed of a ceramic fibre-based refractory heat-insulating material.
Claim 5
Dependent Claim
21 words
A furnace or kiln according to claim 1 wherein the cross-section of the shoulders of the rails is generally `T` shaped.
Claim 6
Dependent Claim
16 words
A furnace or kiln according to claim 1 wherein the shoulders of the rails are bevelled.
Claim 7
Dependent Claim
37 words
A furnace or kiln according to claim 1 wherein the front of the shoulders of the rails has at least one recess and located in the at least one recess there is an electrically insulating ceramic rod.
Claim 8
Dependent Claim
52 words
A furnace or kiln according to claim 1 wherein the boards comprising the inner lining each have a rib extending along an edge of a major face which rib spaces each board a predetermined and generally constant distance away from that part of the furnace or kiln immediately remote from said rib.
Claim 9
Dependent Claim
89 words
A furnace or kiln for the heat-treatment of materials or articles, said furnace or kiln having an inner lining comprising boards of refractory, heat-insulating material wherein said boards are restrained from inward movement by rails of refractory heat-insulating material having shoulders at their inward side, said shoulders each having a front and a back, the front of said shoulders having at least one recess, said at least one recess having an electrically insulating ceramic rod located therein, edge portions of said boards resting against the back of said shoulders.
Claim 10
Dependent Claim
89 words
A furnace or kiln for the heat-treatment of materials or articles, said furnace or kiln having an inner lining comprising boards of refractory, heat-insulating material wherein said boards are restrained from inward movement by rails of refractory heat-insulating material having shoulders at their inward side, said shoulders each having a front and a back, the front of said shoulders having at least one recess, said at least one recess having an electrically insulating ceramic rod located therein, edge portions of said boards resting against the back of said shoulders.
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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) | 1992-06-19 | 1992-12-19 | 1993-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-19 | 1996-12-19 | 1997-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-19 | 2000-12-19 | 2001-06-20 | $7700.00 | Window Closed / Lapsed |