Patent US4921641A successfully refreshed from Google Patents.
US4921641A
Expired / Lapsed
US
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Liquid-vapor contact columns
Assignee: BOC Group Ltd
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Filing: 1989-02-06
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Granted: 1990-05-01
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Expires: 2009-02-06
Abstract
Abstract A packing for a liquid-vapor contact column is provided which comprises metallic sheets defining liquid-vapor passages and having at least one wettable surface comprised of a coating of porous metal. The sheets are perforated to permit vapor to pass between them. The porous metal coating is formed by spraying a particulate mixture of metal and a plastics material onto the sheet to form a coating of plastics particles embedded in metal and then heating to volatilize the plastic thereby forming porosity in the metal coating.
Inventors
- 👤 John T. Lavin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:01
CPC Classifications
C; C23; C23C; C23C4/00; C23C4/04; B; B01; B01J; B01J19/00; B01J19/32; B01J2219/00; B01J2219/32; B01J2219/322; B01J2219/32203; B01J2219/3221; B01J2219/32213; B01J2219/3222; B01J2219/32224; B01J2219/32227; B01J2219/32237; B01J2219/32244; B01J2219/32248; B01J2219/32255; B01J2219/324; B01J2219/32408; Y; Y10; Y10S; Y10S261/00; Y10S261/72
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
101 words
A packing for a liquid-vapor contact column, comprising at least one array of liquid-vapor contact members each defining liquid-vapor passages therethrough and having a wettable surface, wherein each member is comprised of a metallic sheet having at least one wettable surface including a multiplicity of open pores, wherein said surface is formed by spraying a particulate mixture of metal and a plastics material onto a surface of the metallic sheet to form a coating comprising particles of plastics embedded in metal, and heating the coating to volatilize or otherwise remove the plastics material, thereby forming the pores in the metal coating.
Claim 2
Dependent Claim
101 words
A packing for a liquid-vapor contact column, comprising at least one array of liquid-vapor contact members each defining liquid-vapor passages therethrough and having a wettable surface, wherein each member is comprised of a metallic sheet having at least one wettable surface including a multiplicity of open pores, wherein said surface is formed by spraying a particulate mixture of metal and a plastics material onto a surface of the metallic sheet to form a coating comprising particles of plastics embedded in metal, and heating the coating to volatilize or otherwise remove the plastics material, thereby forming the pores in the metal coating.
Claim 3
Dependent Claim
18 words
A packing in accordance with claim 1, wherein the coating has a porosity of from 20% to 50%.
Claim 4
Dependent Claim
21 words
A packing in accordance with claim 1, wherein the average size of the pores is from about 15 to 150 microns.
Claim 5
Dependent Claim
21 words
A packing in accordance with claim 3, wherein the average size of the pores is from about 15 to 50 microns.
Claim 6
Dependent Claim
24 words
A packing in accordance with claim 1, wherein each sheet is formed with alternate crests and troughs so as to define liquid-vapor contact passages.
Claim 7
Dependent Claim
19 words
A packing in accordance with claim 5, wherein the sheets are perforated to enable vapor to pass between them.
Claim 8
Dependent Claim
30 words
A packing in accordance with claim 5 wherein the passages slope on each sheet and the sheets are arranged such that, in alternate sheets, the passages slope in different directions.
Claim 9
Dependent Claim
15 words
A packing in accordance with claim 1, wherein the sheets are of aluminum or copper.
Claim 10
Dependent Claim
24 words
A packing in accordance with claim 8, wherein the metal coating is selected from the group consisting of aluminum, copper and alloys based thereon.
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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) | 1993-04-30 | 1993-10-30 | 1994-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-30 | 1997-10-30 | 1998-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-30 | 2001-10-30 | 2002-05-01 | $7700.00 | Window Closed / Lapsed |