Patent US5133373A successfully refreshed from Google Patents.
Patent US881010A successfully refreshed from Google Patents.
Patent US4680106A successfully refreshed from Google Patents.
US4680106A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrodynamic method for separating components of a mixture
Assignee: United States Department of Agriculture
•
Filing: 1985-07-31
•
Granted: 1987-07-14
•
Expires: 2005-07-31
Abstract
Abstract A method for separating components of a mixture containing particles which can be electrically charged from particles which can be only negligibly charged is disclosed. The mixture is fed onto an electric undulating traveling wave contact panel which is energized to a charging potential using A. C. voltage. The voltage is then increased to a separation voltage to effect levitation and movement of the charged particles away from the uncharged particles. Separation is accomplished by cycling the voltage between the separation and charging voltages until the charged particles are moved off the panel and the uncharged particles remain on the surface of the panel. The separated particles can then be collected separately.
Inventors
- 👤 Louis C. Weiss
- 👤 Devron P. Thibodeaux
- 👤 Mary Ann Godshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:58
CPC Classifications
B; B03; B03C; B03C7/00; B03C7/02; B03C7/023; B03C7/026; B65; B65G; B65G54/00; B65G54/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
118 words
An electrodynamic method for separating components of a mixture comprising: (a) feeding onto a horizontal electric undulating traveling wave contact panel a mixture of particles, said mixture comprised of negligibly charged and charged particles; (b) energizing the panel with sufficient A.C. voltage for sufficient time to impart different charge to mass ratios to the individual particles; (c) increasing the potential for sufficient time to a separation voltage; said separation voltage being that which is sufficient to move said charged particles away from said negligibly charged particles; (d) separating the individual particles by cyclically repeating steps (b) and (c) until all of the charged particles are moved off the panel and the negligibly charged particles remain on the panel.
Claim 2
Dependent Claim
118 words
An electrodynamic method for separating components of a mixture comprising: (a) feeding onto a horizontal electric undulating traveling wave contact panel a mixture of particles, said mixture comprised of negligibly charged and charged particles; (b) energizing the panel with sufficient A.C. voltage for sufficient time to impart different charge to mass ratios to the individual particles; (c) increasing the potential for sufficient time to a separation voltage; said separation voltage being that which is sufficient to move said charged particles away from said negligibly charged particles; (d) separating the individual particles by cyclically repeating steps (b) and (c) until all of the charged particles are moved off the panel and the negligibly charged particles remain on the panel.
Claim 3
Dependent Claim
20 words
The electrodynamic method of claim 1 including mechanically agitating the particles in the center of the panel after step (c).
Claim 4
Dependent Claim
26 words
The method of claim 2 wherein the particles which can be charged are carbon and the particles which can be only negligibly charged are bone char.
Claim 5
Dependent Claim
20 words
The method of claim 3 wherein the particle mixture is a ratio of 1:4 carbon to bone char by weight.
Claim 6
Dependent Claim
18 words
The method of claim 3 wherein the particle mixture is a 1:1 carbon to bone char by weight.
Claim 7
Dependent Claim
27 words
The method of claim 3 wherein the charging time is from about 20 to 150 seconds and the charging voltage is from about 4.0 to 5.0 kV.
Claim 8
Dependent Claim
27 words
The method of claim 3 wherein the separation time is from about 5 to 60 seconds and the separation voltage is from about 4.5 to 6.5 kV.
Claim 9
Dependent Claim
18 words
The method of claim 3 including an additional step of drying the mixture before feeding onto the panel.
References Cited (Backward Citations)
US3801869A
Cited
US3872361A
Cited
US3970905A
Cited
US4252571A
Cited
US4556481A
Cited
US4512879A
Cited
US4534856A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-07-13 | 1991-01-12 | 1991-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-13 | 1995-01-12 | 1995-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-13 | 1999-01-12 | 1999-07-14 | $7700.00 | Window Closed / Lapsed |