US3998933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coke particle filter for pitch fumes to form electrodes
Assignee: Graftech Technology LLC
•
Filing: 1974-09-16
•
Granted: 1976-12-21
•
Expires: 1994-09-16
Abstract
Abstract Vapor, volatile fumes and other contaminants are filtered from an air stream by passing it through a bed of filter particles, which may be coke and using the contaminant coke particles in the processing of electrodes.
Inventors
- 👤 James Tillit Henderson, Jr.
- 👤 Robert Burton Newman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:14
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/528; C04B35/532; B; B01; B01D; B01D46/00; B01D46/30
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
49 words
Modified process in carbon product manufacture which comprises passing aerosol contaminant laden fumes from a carbon processing operation through a filter bed of coke particles to trap and retain said contaminants and then using the resultant contaminant coated coke particles in the feedstock for the manufacture of carbon electrodes.
Claim 2
Dependent Claim
49 words
Modified process in carbon product manufacture which comprises passing aerosol contaminant laden fumes from a carbon processing operation through a filter bed of coke particles to trap and retain said contaminants and then using the resultant contaminant coated coke particles in the feedstock for the manufacture of carbon electrodes.
Claim 3
Dependent Claim
23 words
Process according to claim 1 wherein said filter particles are from about 1/16 inch (1.5 mm) to about 1/2 (13 mm) in diameter.
Claim 4
Dependent Claim
24 words
Process according to claim 1 wherein said filter particles are from about 3/16 inch (4.5 mm) to about 3/8 inch (9 mm) in diameter.
Claim 5
Dependent Claim
26 words
Process according to claim 1 wherein said coke type filter particles are from about 1/8 inch (3 mm) to about 1/4 inch (6 mm) in diameter.
Claim 6
Dependent Claim
25 words
Process according to claim 1 wherein the depth of said filter bed is from about 11/2 inches (3.75 cm) to about 6 inches (15 cm).
Claim 7
Dependent Claim
18 words
Process according to claim 1 wherein the depth of said filter bed is about 2 inches (5 cm).
Claim 8
Dependent Claim
22 words
Process according to claim 1 wherein the temperature of said contaminant laden air is no higher than about 65° C (150° F).
Claim 9
Dependent Claim
24 words
Process according to claim 1 wherein the velocity of said contaminant laden air is at least 500 feet per minute (150 meters per minute).
Claim 10
Dependent Claim
23 words
Process according to claim 1 wherein the velocity of said contaminant laden air is about 1000 feet per minute (300 meters per minute).
Claim 11
Dependent Claim
50 words
Modified process in carbon product manufacture which comprises passing aerosol contaminant laden fumes from a carbon processing operation through a filter bed of coke particles to trap and retain said contaminants and then using the resultant contaminant coated coke particles as packing around electrodes in the heat processing of electrodes.
Claim 12
Dependent Claim
50 words
Modified process in carbon product manufacture which comprises passing aerosol contaminant laden fumes from a carbon processing operation through a filter bed of coke particles to trap and retain said contaminants and then using the resultant contaminant coated coke particles as packing around electrodes in the heat processing of electrodes.
Claim 13
Dependent Claim
23 words
Process according to claim 10 wherein said filter particles are from about 1/16 inch (1.5 mm) to about 1/2 (13 mm) in diameter.
Claim 14
Dependent Claim
24 words
Process according to claim 10 wherein said filter particles are from about 3/16 inch (4.5 mm) to about 3/8 inch (9 mm) in diameter.
Claim 15
Dependent Claim
26 words
Process according to claim 10 wherein said coke type filter particles are from about 1/8 inch (3 mm) to about 1/4 inch (6 mm) in diameter.
Claim 16
Dependent Claim
25 words
Process according to claim 10 wherein the depth of said filter bed is from about 11/2 inches (3.75 cm) to about 6 inches (15 cm).
Claim 17
Dependent Claim
18 words
Process according to claim 10 wherein the depth of said filter bed is about 2 inches (5 cm).
Claim 18
Dependent Claim
22 words
Process according to claim 10 wherein the temperature of said contaminant laden air is no higher than about 65° C (150° F).
Claim 19
Dependent Claim
24 words
Process according to claim 10 wherein the velocity of said contaminant laden air is at least 500 feet per minute (150 meters per minute).
Claim 20
Dependent Claim
23 words
Process according to claim 10 wherein the velocity of said contaminant laden air is about 1000 feet per minute (300 meters per minute).
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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) | 1979-12-21 | 1980-06-21 | 1980-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-21 | 1984-06-21 | 1984-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-21 | 1988-06-21 | 1988-12-21 | $7700.00 | Window Closed / Lapsed |