Patent US4772508A successfully refreshed from Google Patents.
US4772508A
Expired / Lapsed
US
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Activated carbon-carbon composite of high surface area and high compressive strength
Assignee: Individual
•
Filing: 1986-01-24
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Granted: 1988-09-20
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Expires: 2006-01-24
Abstract
Abstract A carbon bonded carbon fiber composite having a surface area greater than about 10 m 2 /g, and a compressive strength of about 20 psi or higher provides excellent filtering capacity in an activated carbon able to withstand heretofore intolerable environmental disturbances.
Inventors
- 👤 Gilbert W. Brassell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:01
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/28; B01J20/28014; B01J20/28023; B01J20/02; B01J20/20; B01J20/28054; B01J20/28057; C; C04; C04B; C04B35/00; C04B35/71; C04B35/78; C04B35/80; C04B35/83; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/24992; Y10T428/29; Y10T428/2904; Y10T428/2905; Y10T428/2913; Y10T428/2918; Y10T428/292; Y10T428/30; Y10T428/31
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
27 words
A carbon bonded carbon fiber composite having a surface area greater than about 10 m 2 /g, and a compressive strength of about 20 psi or higher.
Claim 2
Dependent Claim
27 words
A carbon bonded carbon fiber composite having a surface area greater than about 10 m 2 /g, and a compressive strength of about 20 psi or higher.
Claim 3
Dependent Claim
27 words
A carbon bonded carbon fiber composite having a surface area greater than about 100 m 2 /g, and a compressive strength of about 100 psi or higher.
Claim 4
Dependent Claim
27 words
A carbon bonded carbon fiber composite having a surface area greater than about 100 m 2 /g, and a compressive strength of about 100 psi or higher.
Claim 5
Dependent Claim
22 words
A composite of claim 1, having a surface area of 600-1,000 m 2 /g and a compressive strength of about 100-145 psi.
Claim 6
Dependent Claim
22 words
A composite of claim 1, having a surface area of 600-800 m 2 /g and a compressive strength of about 100-140 psi.
Claim 7
Dependent Claim
21 words
A composite of claim 2, wherein the carbon fibers are derived from carbonization of polyacrylonitrile fibers, rayon fibers or pitch fibers.
Claim 8
Dependent Claim
21 words
A composite of claim 3, wherein the carbon which bonds the carbon fibers is derived from carbonization of a phenolic resin.
Claim 9
Dependent Claim
21 words
A composite of claim 5, wherein the carbon which bonds the carbon fibers is derived from carbonization of a phenolic resin.
Claim 10
Dependent Claim
17 words
A composite of claim 2, wherein the carbon fibers have been exposed to a surface activation treatment.
Claim 11
Dependent Claim
23 words
A composite of claim 2, wherein both the carbon fibers and the carbon bonding material have been exposed to a surface activation treatment.
Claim 12
Dependent Claim
29 words
A composite of claim 8, wherein said treatment comprises exposure of the fibers to carbon dioxide or steam at an elevated temperature effective to increase the surface area thereof.
Claim 13
Dependent Claim
33 words
A composite of claim 9, wherein said treatment comprises exposure of the fibers and carbon bonding material to carbon dioxide or steam at an elevated temperature effective to increase the surface area thereof.
Claim 14
Dependent Claim
48 words
A composite of claim 1, wherein both the carbon fibers and the carbon bonding material have been exposed to a surface activation treatment comprising exposure of the fibers and carbon bonding material to carbon dioxide or steam at an elevated temperature effective to increase the surface area thereof.
Claim 15
Dependent Claim
65 words
In a carbon bonded carbon fiber composite having a surface area of about 1 m 2 /g and a compressive strength of about 20 psi or higher, the improvement wherein the composite is exposed to a surface activation treatment, during or after its preparation, whereby its surface area is increased to greater than about 10 m 2 /g and its compressive strength remains substantially unchanged.
Claim 16
Dependent Claim
65 words
In a carbon bonded carbon fiber composite having a surface area of about 1 m 2 /g and a compressive strength of about 20 psi or higher, the improvement wherein the composite is exposed to a surface activation treatment, during or after its preparation, whereby its surface area is increased to greater than about 10 m 2 /g and its compressive strength remains substantially unchanged.
Claim 17
Dependent Claim
51 words
In a carbon bonded ceramic fiber composite having a certain surface area and compressive strength, the improvement wherein the composite is exposed to surface activation treatment, during or after its preparation, whereby its surface area is increased by at least an order of magnitude and its compressive strength remains substantially unchanged.
Claim 18
Dependent Claim
51 words
In a carbon bonded ceramic fiber composite having a certain surface area and compressive strength, the improvement wherein the composite is exposed to surface activation treatment, during or after its preparation, whereby its surface area is increased by at least an order of magnitude and its compressive strength remains substantially unchanged.
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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) | 1991-09-20 | 1992-03-21 | 1992-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-20 | 1996-03-21 | 1996-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-20 | 2000-03-21 | 2000-09-20 | $7700.00 | Window Closed / Lapsed |