US4055628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing graphite containing carbon
Assignee: BP PLC
•
Filing: 1976-09-22
•
Granted: 1977-10-25
•
Expires: 1996-09-22
Abstract
Abstract Graphite-containing carbon is prepared by subjecting carbon to the steps of (1) an initial heat treatment in an inert atmosphere, (2) an oxidation stage and (3) a further heat treatment in an inert atmosphere.
Inventors
- 👤 John James McCarroll
- 👤 John Trevor Kent Clark
- 👤 Stephen Robert Tennison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:31
CPC Classifications
B; B01; B01J; B01J35/00; B01J35/60; B01J21/00; B01J21/18; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01J23/58; C; C01; C01B; C01B32/00; B01J35/61; B01J35/617; B01J35/618; C07; C07C; C07C2521/00; C07C2521/18; C07C2523/00; C07C2523/02; C07C2523/04; C07C2523/38; C07C2523/40; C07C2523/42; C07C2523/46; C07C2523/54; C07C2523/56; C07C2523/58; C07C2601/00; C07C2601/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
136 words
A method for the preparation of a graphite-containing carbon having (1) a basal plane surface area of at least 100 m 2 /g; (2) a ratio of BET surface area to basal plane surface area of not more than 5:1; and (3) a ratio of basal plane surface area to edge surface area of at least 5:1, which method comprises treating a high surface area carbon having a BET surface area of at least 500 m 2 /g to the steps of (1) an initial heat treatment in an inert atmosphere at a temperature between 900° C and 3300° C; (2) oxidation stage by heating in an oxidizing atmosphere at a temperature between 300° and 1200° C; and (3) a further heat treatment in an inert atmosphere at a temperature between 1000° C and 3000° C.
Claim 2
Independent Claim
136 words
A method for the preparation of a graphite-containing carbon having (1) a basal plane surface area of at least 100 m 2 /g; (2) a ratio of BET surface area to basal plane surface area of not more than 5:1; and (3) a ratio of basal plane surface area to edge surface area of at least 5:1, which method comprises treating a high surface area carbon having a BET surface area of at least 500 m 2 /g to the steps of (1) an initial heat treatment in an inert atmosphere at a temperature between 900° C and 3300° C; (2) oxidation stage by heating in an oxidizing atmosphere at a temperature between 300° and 1200° C; and (3) a further heat treatment in an inert atmosphere at a temperature between 1000° C and 3000° C.
Claim 3
Dependent Claim
26 words
A method according to claim 1 wherein the oxidation stage is carried out in an atmosphere of air at a temperature in the range 300°-450° C.
Claim 4
Independent Claim
29 words
A method according to claims 1 wherein the oxidation stage is carried out in an atmosphere of steam or carbon dioxide at a temperature in the range 800°-1200° C.
Claim 5
Dependent Claim
21 words
A method according to claim 1 wherein the third stage is carried out at a temperature between 1000° and 2000° C.
Claim 6
Dependent Claim
22 words
A method according to claim 1 wherein the basal plane surface area is in the range 150 to 1000 m 2 /g.
Claim 7
Dependent Claim
24 words
A method according to claim 1 wherein the ratio of the basal plane surface area to the edge surface area is greater than 10:1.
Claim 8
Dependent Claim
24 words
A method according to claim 1 wherein the ratio of the basal plane surface area to the edge surface area is greater than 300:1.
Claim 9
Dependent Claim
24 words
A method according to claim 1 wherein the high surface area carbon initially has a BET surface area up to 3000 m 2 /g.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-24 | 1981-04-25 | 1981-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-24 | 1985-04-25 | 1985-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-24 | 1989-04-25 | 1989-10-25 | $7700.00 | Window Closed / Lapsed |