US4079109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making carbon electrodes
Assignee: Vereinigte Aluminium Werke AG
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Filing: 1976-03-23
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Granted: 1978-03-14
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Expires: 1996-03-23
Abstract
Abstract A method for producing coherent shaped bodies from granular material. The granular material is confined in a mold and the mold is subjected to vibratory motions requisite for compacting the granular material. The frequency of the vibratory motions is continuously increased until compaction is achieved.
Inventors
- 👤 Gunter Helmrich
- 👤 Fritz Wulfing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:51
CPC Classifications
B; B30; B30B; B30B11/00; B30B11/02; B30B11/022
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
120 words
In a method from a granular mass which includes a viscous binder and granules of a carbon base material, the steps comprising providing a vibratory compacting device including a mold mounted for vibratory movement; confining said granular mass in said mold; resting a cover weight freely on top of said granular mass; vibrating said mold at a first frequency while said cover weight rests freely on said granular mass until partial compacting of said granular mass is effected; thereafter applying a substantial force to said cover weight to brace it against said partially compacted granular mass; and vibrating said mold at a second frequency substantially higher than said first frequency while said cover plate is braced against said granular mass.
Claim 2
Dependent Claim
120 words
In a method from a granular mass which includes a viscous binder and granules of a carbon base material, the steps comprising providing a vibratory compacting device including a mold mounted for vibratory movement; confining said granular mass in said mold; resting a cover weight freely on top of said granular mass; vibrating said mold at a first frequency while said cover weight rests freely on said granular mass until partial compacting of said granular mass is effected; thereafter applying a substantial force to said cover weight to brace it against said partially compacted granular mass; and vibrating said mold at a second frequency substantially higher than said first frequency while said cover plate is braced against said granular mass.
Claim 3
Dependent Claim
42 words
A method according to claim 1 wherein said carbon base material comprises coke granules with a grain size less than 20 mm. and a pouring weight between 0.5 and 1.1 grams per cubic centimeter, and wherein said viscous binder comprises coal-tar pitch.
Claim 4
Dependent Claim
28 words
A method according to claim 2, wherein said coke granules comprise 70-82% of said granular mass, the remainder of said granular mass consisting essentially of said coal-tar pitch.
Claim 5
Dependent Claim
20 words
A method according to claim 1, wherein said first frequency is accommodated to the resonance characteristics of the granular mass.
Claim 6
Dependent Claim
41 words
A method according to claim 4, wherein said second, higher frequency is at least a multiple of said first frequency and is a function of the resonance characteristics of the vibrating system with said cover weight braced against said granular mass.
Claim 7
Dependent Claim
18 words
A method according to claim 5 wherein said first frequency is continuously increased as said material is compacted.
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) | 1981-03-13 | 1981-09-12 | 1982-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-13 | 1985-09-12 | 1986-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-13 | 1989-09-12 | 1990-03-14 | $7700.00 | Window Closed / Lapsed |