Patent US4580404A successfully refreshed from Google Patents.
US4580404A
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Method for adsorbing and storing hydrogen at cryogenic temperatures
Assignee: Sumitomo SHI Cryogenics of America Inc
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Filing: 1985-08-09
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Granted: 1986-04-08
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Expires: 2005-08-09
Abstract
Abstract Hydrogen is stored at cryogenic temperatures by adsorption on porous carbon having a nitrogen BET apparent surface area above about 1500 m 2 /g. Hydrogen can be adsorbed and desorbed in the context of a cryopump, having as the pumping element a panel, having large particles of pressed porous carbon thereon.
Inventors
- 👤 Guido P. Pez
- 👤 William A. Steyert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:34
CPC Classifications
F; F04; F04B; F04B37/00; F04B37/02; F04B37/04; Y; Y10; Y10S; Y10S417/00; Y10S417/901
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
52 words
In a high vacuum pump comprising a cryoadsorption pumping element and means for cooling the pumping element to the cryogenic temperature range, the improvement wherein the pumping element comprises porous carbon particles having a nitrogen BET apparent surface area above about 1500 m 2 /g and dimensions greater than about 1.5×1.5×1.5 mm.
Claim 2
Dependent Claim
52 words
In a high vacuum pump comprising a cryoadsorption pumping element and means for cooling the pumping element to the cryogenic temperature range, the improvement wherein the pumping element comprises porous carbon particles having a nitrogen BET apparent surface area above about 1500 m 2 /g and dimensions greater than about 1.5×1.5×1.5 mm.
Claim 3
Dependent Claim
40 words
The pump of claim 1, wherein the porous carbon particles have a bulk density greater than about 0.25 g/cm 3 and a cage-like structure which contributes to over 60% of its surface, as measured by phase contrast, high resolution microscopy.
Claim 4
Dependent Claim
23 words
The pump of claim 1, wherein the porous carbon particles have a nitrogen BET apparent surface area above about 2000 m 2 /g.
Claim 5
Dependent Claim
23 words
The pump of claim 1, wherein the porous carbon particles have a nitrogen BET apparent surface area above about 2200 m 2 /g.
Claim 6
Dependent Claim
17 words
The pump of claim 1, wherein the porous carbon particles have dimensions greater than about 2×2×2 mm.
Claim 7
Dependent Claim
78 words
The pump of claim 1, wherein the porous carbon particles have a nitrogen BET apparent surface area greater than 2300 m 2 /g, made by treating a carbonaceous feed with hydrous potassium hydroxide in an amount of 0.5-5 weights per weight of carbonaceous feed; precalcining the mixture of hydrous potassium hydroxide and carbonaceous feed at 315°-482° C. for 15 min-2 h and calcining the thus pre-calcined feed at 704°-982° C. for 20 min-4 h under an inert atmosphere.
Claim 8
Dependent Claim
36 words
The pump of claim 1, wherein the pumping element is a panel, having pressed thereon porous carbon particles of nitrogen BET apparent surface area above about 2000 m 2 /g and dimensions above about 2.5×2.5×2.5 mm.
Claim 9
Dependent Claim
48 words
A panel assembly for a cryoadsorption pump, comprising a high thermal conductivity metal panel adapted for cooling by a cryogenic fluid, the metal panel having mounted thereon porous carbon particles having a nitrogen BET apparent surface area above 1500 m 2 /g and dimensions greater than 1.5×1.5×1.5 mm.
Claim 10
Dependent Claim
48 words
A panel assembly for a cryoadsorption pump, comprising a high thermal conductivity metal panel adapted for cooling by a cryogenic fluid, the metal panel having mounted thereon porous carbon particles having a nitrogen BET apparent surface area above 1500 m 2 /g and dimensions greater than 1.5×1.5×1.5 mm.
Claim 11
Dependent Claim
41 words
The panel assembly of claim 8, wherein the porous carbon particles have a bulk density greater than about 0.25 g/cm 3 and a cage-like structure which contributes to over 60% of its surface, as measured by phase contrast high resolution microscopy.
Claim 12
Dependent Claim
23 words
The panel of claim 8, wherein the porous carbon particles have a nitrogen BET apparent surface area above about 2000 m 2 /g.
Claim 13
Dependent Claim
18 words
The panel of claim 8, wherein the porous carbon particles are affixed to the metal panel by pressing.
Claim 14
Dependent Claim
21 words
The panel of claim 8, wherein the porous carbon particles are applied to the metal panel in the form of pellets.
Claim 15
Dependent Claim
16 words
The panel of claim 8, wherein the porous carbon particles have dimensions above about 2×2×2 mm.
Claim 16
Dependent Claim
12 words
The panel of claim 13, wherein the panel is a cylindrical surface.
Claim 17
Dependent Claim
12 words
The panel of claim 13, wherein the panel is an extended surface.
Claim 18
Dependent Claim
13 words
The panel of claim 13, wherein the panel is a surface of revolution.
Claim 19
Dependent Claim
34 words
The panel of claim 8, wherein the porous carbon particles have a nitrogen BET apparent surface area above about 2200 m 2 /g and are applied to the panel in the form of pellets.
Claim 20
Dependent Claim
36 words
The panel of claim 8, wherein the panel is an extended surface and the porous carbon particles have a nitrogen BET apparent surface area above about 2000 m 2 /g and dimensions above about 2×2×2 mm.
Claim 21
Dependent Claim
52 words
A method for maintaining high initial hydrogen pumping speed, characteristic of adsorbent carbons of 1-1.5 mm or smaller in a high vacuum pump comprising a cryoadsorption pumping element and means for cooling the pumping element to the cryogenic temperature range, comprising using in the cryoadsorption pump the panel assembly of claim 18.
Claim 22
Dependent Claim
52 words
A method for maintaining high initial hydrogen pumping speed, characteristic of adsorbent carbons of 1-1.5 mm or smaller in a high vacuum pump comprising a cryoadsorption pumping element and means for cooling the pumping element to the cryogenic temperature range, comprising using in the cryoadsorption pump the panel assembly of claim 8.
Claim 23
Independent Claim
67 words
A method for maintaining high initial hydrogen pumping speed, characteristic of adsorbent carbon particles of 1-1.5 mm or smaller, in a high vacuum pump comprising a cryoadsorption pumping element and means for cooling the pumping element to the cryogenic temperature range, comprising using as pumping element porous carbon particles having a nitrogen BET apparent surface area above 1500 m 2 /g and dimensions above about 1.5×1.5×1.5 mm.
Claim 24
Independent Claim
67 words
A method for maintaining high initial hydrogen pumping speed, characteristic of adsorbent carbon particles of 1-1.5 mm or smaller, in a high vacuum pump comprising a cryoadsorption pumping element and means for cooling the pumping element to the cryogenic temperature range, comprising using as pumping element porous carbon particles having a nitrogen BET apparent surface area above 1500 m 2 /g and dimensions above about 1.5×1.5×1.5 mm.
Claim 25
Dependent Claim
40 words
The method of claim 21, wherein the porous carbon particles have a bulk density greater than about 0.25 g/cm 3 and a cage-like structure which contributes to over 60% of its surface, as measured by phase contrast, high resolution microscopy.
Claim 26
Dependent Claim
30 words
The method of claim 21, wherein the porous carbon particles have a nitrogen BET apparent surface area above about 2000 m 2 /g and dimensions greater than about 2×2×2 mm.
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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) | 1989-04-07 | 1989-10-07 | 1990-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-07 | 1993-10-07 | 1994-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-07 | 1997-10-07 | 1998-04-08 | $7700.00 | Window Closed / Lapsed |