US4025668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing contact bodies
Assignee: Carl Munters AB
•
Filing: 1975-04-01
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Granted: 1977-05-24
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Expires: 1995-04-01
Abstract
Abstract A method of manufacturing a contact body is disclosed wherein the contact body is built up of thin layers of hydrated asbestos fibers shaped between mutually spaced support positions to form channels extending from end to end of the contact body. The layers have a coating thereon of at least one inorganic substance and the layer body is heated to at least the dehydration temperature of the asbestos, at which the water of crystallization is released by passing a current of hot gas through the channels in the contact body for a relatively short period of time in order to effect the intended action on the body.
Inventors
- 👤 Per Norback
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:59
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; C; C04; C04B; C04B30/00; C04B30/02; F; F24; F24F; F24F3/00; F24F3/12; F24F3/14; F24F3/1411; F24F3/1423; B32B2262/00; B32B2262/10; B32B2307/00; B32B2307/50; B32B2310/00; B32B2310/04; B32B2310/0445; F24F2203/00; F24F2203/10; F24F2203/1032; F24F2203/1036; F24F2203/104; F24F2203/1048
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
142 words
A method of manufacturing a contact body which is built up of thin layers of hydrated asbestos fillers shaped between mutually spaced support positions to form channels extending from end to end, the layers having a coating thereon formed of at least one inorganic substance having the property that it will form a support skeleton for the asbestos layers to which it is applied, after water in the asbestos fibers is removed therefrom, said method comprising the steps of heating the layer body to at least the dehydration temperature of the asbestos fibers to release the water of crystallization therefrom by heating a stream of gas and then passing a current of the heated gas through the channels in the body for a relatively short time of one hour or less to remove water, including the water of crystallization, from the body.
Claim 2
Independent Claim
142 words
A method of manufacturing a contact body which is built up of thin layers of hydrated asbestos fillers shaped between mutually spaced support positions to form channels extending from end to end, the layers having a coating thereon formed of at least one inorganic substance having the property that it will form a support skeleton for the asbestos layers to which it is applied, after water in the asbestos fibers is removed therefrom, said method comprising the steps of heating the layer body to at least the dehydration temperature of the asbestos fibers to release the water of crystallization therefrom by heating a stream of gas and then passing a current of the heated gas through the channels in the body for a relatively short time of one hour or less to remove water, including the water of crystallization, from the body.
Claim 3
Dependent Claim
30 words
A method according to claim 1 wherein the layer body is coated with two inorganic substances and the heating of the layer body effects the sintering together of the substances.
Claim 4
Dependent Claim
39 words
A method according to claim 2 wherein a solvent used for applying the inorganic substances onto the asbestos layers is released in the same treating step as the heating with the hot gas current to produce the final product.
Claim 5
Dependent Claim
11 words
A method according to claim 3 wherein the solvent is water.
Claim 6
Dependent Claim
39 words
A method according to claim 1 wherein the temperature and the velocity of the gas current are adjusted so that the properties of the final product are reached by treatment with the gas current in less than one hour.
Claim 7
Dependent Claim
17 words
A method according to claim 5 wherein the treatment is effected within less than half an hour.
Claim 8
Dependent Claim
37 words
A method according to claim 1 wherein the asbestos layers contain an organic binding agent keeping the fibers together and the heat treatment causes the binding agent to burn, thus transferring heat to the hot gas current.
Claim 9
Dependent Claim
43 words
A method according to claim 7, wherein the organic binding agent is present in sufficient quantity so that a substantial amount of the heat required for the increase of temperature during the heat treatment is provided by the combustion of the organic material.
Claim 10
Independent Claim
157 words
A method of manufacturing a contact body which is formed of a plurality of thin layers of hydrated asbestos fibers shaped between mutually spaced support positions to form channels extending from end to end, the layers having a coating thereon formed of at least one inorganic substance selected from the group consisting of sodium or potassium waterglass with calcium chloride and silica to form a support skeleton for the asbestos layers to which it is applied after water in the asbestos fibers is removed therefrom, said method comprising the steps of heating the layer body to at least the dehydration temperature of the asbestos fibers to release the water of crystallization therefrom by heating a stream of gas to approximately 1000° C. and passing a current of the heated gas through the channels in the body for a relatively short time of one hour or less to remove water, including the water of crystallization from the body.
Claim 11
Independent Claim
157 words
A method of manufacturing a contact body which is formed of a plurality of thin layers of hydrated asbestos fibers shaped between mutually spaced support positions to form channels extending from end to end, the layers having a coating thereon formed of at least one inorganic substance selected from the group consisting of sodium or potassium waterglass with calcium chloride and silica to form a support skeleton for the asbestos layers to which it is applied after water in the asbestos fibers is removed therefrom, said method comprising the steps of heating the layer body to at least the dehydration temperature of the asbestos fibers to release the water of crystallization therefrom by heating a stream of gas to approximately 1000° C. and passing a current of the heated gas through the channels in the body for a relatively short time of one hour or less to remove water, including the water of crystallization from the body.
References Cited (Backward Citations)
US1972500A
Cited
US2282230A
Cited
US2354350A
Cited
US2354351A
Cited
US2434466A
Cited
GB998132A
Cited
GB1040061A
Cited
GB1140042A
Cited
US3499812A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |