Patent US4029600A successfully refreshed from Google Patents.
US4029600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon particulates with controlled density
Assignee: Wyeth Holdings LLC
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Filing: 1976-05-20
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Granted: 1977-06-14
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Expires: 1996-05-20
Abstract
Abstract Carbon particulates comprising carbon black spheres and a carbon binder having large pores as well as desirable pore size distributions are disclosed which are useful as selective adsorbants. A method of preparation and various uses are also disclosed.
Inventors
- 👤 Joseph Lawrence Schmitt, Jr.
- 👤 Philip Leroy Walker, Jr.
- 👤 George Augustus Castellion
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:00
CPC Classifications
C; C13; C13B; C13B20/00; C13B20/12; C13B20/123; B; B01; B01J; B01J21/00; B01J21/18; B01J23/00; B01J23/38; B01J23/40; B01J23/42; C01; C01B; C01B32/00; C01B32/30; C01B32/354; C01B32/382; C01B32/384; C07; C07C; C07C209/00; C07C209/30; C07C209/32; C07C209/36
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
115 words
A porous carbon particulate comprising carbon black spheres bonded in molded relationship by a carbonized binder, said spheres having an average diameter in the range of about 80 to 5000 angstrom units and a surface area of at least 100 square meters per gram, and said particulate having a pore volume of at least 0.2 cubic centimeters per gram, a surface area of at least 100 square meters per gram, said particulate surface area being equal to or less than the surface area of said spheres, and a pore size distribution such that at least about 45% of its total surface area is in pores of radius equal to or greater than 20 angstrom units.
Claim 2
Dependent Claim
115 words
A porous carbon particulate comprising carbon black spheres bonded in molded relationship by a carbonized binder, said spheres having an average diameter in the range of about 80 to 5000 angstrom units and a surface area of at least 100 square meters per gram, and said particulate having a pore volume of at least 0.2 cubic centimeters per gram, a surface area of at least 100 square meters per gram, said particulate surface area being equal to or less than the surface area of said spheres, and a pore size distribution such that at least about 45% of its total surface area is in pores of radius equal to or greater than 20 angstrom units.
Claim 3
Dependent Claim
19 words
The carbon particulate of claim 1 having a pore volume of about 0.4 to 1.1 cubic centimeters per gram.
Claim 4
Dependent Claim
18 words
The carbon particulate of claim 1 having a composition of more than about 99 weight percent of carbon.
Claim 5
Dependent Claim
18 words
The carbon particulate of claim 1 having a surface area of at least 200 square meters per gram.
Claim 6
Dependent Claim
23 words
The carbon particulate of claim 1 wherein at least 40% of its total surface area is in pores of radius 40-200 angstrom units.
Claim 7
Dependent Claim
58 words
A process for preparing the porous carbon particulate of claim 1 which comprises uniformly admixing carbon black spheres having diameters in the range of 80 to 5000 angstrom units and a surface area of at least about 100 square meters per gram with a carbonizable molding binder, the resulting mixture into a suitable structure, and carbonizing said binder.
Claim 8
Dependent Claim
13 words
The process of claim 6 wherein the binder is a carbonizable natural product.
Claim 9
Dependent Claim
14 words
The process of claim 7 wherein said carbonizable natural product is coal tar pitch.
Claim 10
Dependent Claim
12 words
The process of claim 6 wherein the binder is a thermosetting resin.
Claim 11
Dependent Claim
12 words
The process of claim 9 wherein said thermosetting resin is poly(furfuryl alcohol).
Claim 12
Dependent Claim
11 words
The process of claim 9 wherein said thermosetting resin is phenol-formaldehyde.
Claim 13
Dependent Claim
12 words
The process of claim 6 wherein said binder is a thermoplastic polymer.
Claim 14
Dependent Claim
11 words
The process of claim 12 wherein said thermoplastic binder is polyacrylonitrile.
Claim 15
Dependent Claim
22 words
The process of claim 6 wherein the ratio of carbon black spheres to binder is from about 10:1 to about 0.1:1, respectively.
Claim 16
Dependent Claim
21 words
The process of claim 6 wherein the ratio of carbon black spheres to binder is from about 5:1 to about 1:1.
Claim 17
Dependent Claim
18 words
The process of claim 6 wherein said binder provides a carbon yield greater than about 20 weight percent.
Claim 18
Dependent Claim
13 words
The process of claim 6 wherein said molding is by means of extrusion.
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) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |