US3818545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radioactive static electricity eliminator
Assignee: NUCLEAR RADIATION DEV Inc
•
Filing: 1971-08-25
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Granted: 1974-06-25
•
Expires: 1991-08-25
Abstract
Abstract A radioactive device to remove static electricity charges including a radioactive foil maintained in a grounded housing protected by a grounded metal grid, so located and of such physical dimensions, as to afford maximum protection against physical contact with the active element and minimum physical and electrical shielding of the effective radiations. For applications involving extremely high static charges, or where complete removal of static charges is essential, the grid may also incorporate metal brushes. In the latter version, the radioactive foil creates a region of high density ionization adjacent to the opening in the housing, with maximum density enveloping the points of the brushes, greatly enhancing the normal effectiveness of the brushes and making the device capable of effectively removing a wide range of static electrical charges and finds great use in the elimination of static electricity from moving materials such as paper, plastic, clothing, etc. created during their processing operation.
Inventors
- 👤 O Olson
- 👤 D Radosavljevic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:02
CPC Classifications
H; H05; H05F; H05F3/00; H05F3/06
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
137 words
A radioactive static electricity eliminator comprising a substantially rectangular housing provided with an open longitudinal face and including a radioactive foil disposed horizontally therein which emits radioactive particles ionizing a region adjacent to said open longitudinal face, said open face being provided with a metal grid provided with metal brushes connected perpendicularly to the open planal face of said metal grid, said metal brushes being disposed in the adjacent region to said open longitudinal face where the radioactive particles emitted from the radioactive foil create the greatest density of ionization, said metal brushes, metal grid, radioactive foil and housing being electrically connected to a positively grounded cable of low resistance such that articles having an electrostatic charge, on passing through or near the ionized region immediately adjacent to the open face of said housing, will be discharged.
Claim 2
Dependent Claim
137 words
A radioactive static electricity eliminator comprising a substantially rectangular housing provided with an open longitudinal face and including a radioactive foil disposed horizontally therein which emits radioactive particles ionizing a region adjacent to said open longitudinal face, said open face being provided with a metal grid provided with metal brushes connected perpendicularly to the open planal face of said metal grid, said metal brushes being disposed in the adjacent region to said open longitudinal face where the radioactive particles emitted from the radioactive foil create the greatest density of ionization, said metal brushes, metal grid, radioactive foil and housing being electrically connected to a positively grounded cable of low resistance such that articles having an electrostatic charge, on passing through or near the ionized region immediately adjacent to the open face of said housing, will be discharged.
Claim 3
Dependent Claim
21 words
A radioactive static electricity eliminator according to claim 1 wherein the radioactive foil comprises material that emits radioactive particles including alpha-particles.
Claim 4
Dependent Claim
18 words
A radioactive static electricity eliminator according to claim 1 wherein the radioactive foil emits radioactive particles including beta-particles.
Claim 5
Dependent Claim
18 words
A radioactive static electricity eliminator according to claim 1 wherein the radioactive foil emits radioactive particles including gamma-particles.
Claim 6
Dependent Claim
18 words
A radioactive static electricity eliminator according to claim 1 wherein the radioactive foil emits radioactive particles including X-rays.
Claim 7
Dependent Claim
21 words
A radioactive static electricity eliminator according to claim 1 wherein the metal brushes are electrically connected independently to the grounding cable.
Claim 8
Dependent Claim
29 words
A radioactive static electricity eliminator according to claim 1 wherein the metal brushes consist of wire having a diameter in the range of about 0.010 to about 0.001 inches.
Claim 9
Dependent Claim
27 words
A radioactive static electricity eliminator according to claim 1 wherein the side walls are sloped at an angle in the range from about 50* to about 60*.
Claim 10
Dependent Claim
35 words
A radioactive static electricity eliminator according to claim 1 wherein the grid is provided with a substantially large grate which protects the radioactive foil by preventing the admission into the housing of a person''s finger.
Claim 11
Dependent Claim
28 words
A radioactive static electricity eliminator according to claim 1 wherein the metal grid is maintained in the range of about 1/4 to 1/2 inch above the radioactive foil.
Claim 12
Dependent Claim
30 words
A radioactive static electricity eliminator according to claim 1 wherein the tips of the brushes are maintained in a range of about 1/2 to 2 inches above the radioactive foil.
Claim 13
Dependent Claim
155 words
A radioactive static electricity eliminator comprising a substantially rectangular housing including substantially thick sloping side walls, a substantially thick back wall, an open longitudinal face, and a radioactive foil disposed horizontally therein which emits radioactive particles ionizing a region adjacent to said open longitudinal face, said open face being provided with a metal grid, said metal grid being provided with a substantially large grate, and having metal brushes connected perpendicularly to the open planal face of said metal grid, said metal brushes being disposed in the adjacent region of said open longitudinal face where the radioactive particles emitted from the radioactive foil create the greatest density of ionization, said metal brushes, metal grid, radioactive foil and housing being electrically connected to a positively grounded cable of low resistance such that articles having an electrostatic charge, on passing through or near the ionized region immediately adjacent to the open face of said housing, will be discharged.
Claim 14
Dependent Claim
155 words
A radioactive static electricity eliminator comprising a substantially rectangular housing including substantially thick sloping side walls, a substantially thick back wall, an open longitudinal face, and a radioactive foil disposed horizontally therein which emits radioactive particles ionizing a region adjacent to said open longitudinal face, said open face being provided with a metal grid, said metal grid being provided with a substantially large grate, and having metal brushes connected perpendicularly to the open planal face of said metal grid, said metal brushes being disposed in the adjacent region of said open longitudinal face where the radioactive particles emitted from the radioactive foil create the greatest density of ionization, said metal brushes, metal grid, radioactive foil and housing being electrically connected to a positively grounded cable of low resistance such that articles having an electrostatic charge, on passing through or near the ionized region immediately adjacent to the open face of said housing, will be discharged.
Claim 15
Dependent Claim
32 words
A radioactive static electricity eliminator according to claim 12 wherein the metal grid is horizontally disposed between the side walls of the housing substantially below the open longitudinal face of the housing.
Claim 16
Dependent Claim
21 words
A radioactive static electricity eliminator according to claim 12 wherein the radioactive foil comprises material that emits radioactive particles including alpha-particles.
Claim 17
Dependent Claim
18 words
A radioactive static electricity eliminator according to claim 12 wherein the radioactive foil emits radioactive particles including beta-particles.
Claim 18
Dependent Claim
18 words
A radioactive static electricity eliminator according to claim 12 wherein the radioactive foil emits radioactive particles including gamma-particles.
Claim 19
Dependent Claim
18 words
A radioactive static electricity eliminator according to claim 12 wherein the radioactive foil emits radioactive particles including X-rays.
Claim 20
Dependent Claim
21 words
A radioactive static electricity eliminator according to claim 12 wherein the metal brushes are electrically connected independently to the grounding cable.
Claim 21
Dependent Claim
28 words
A radioactive static electricity eliminator according to claim 12 wherein the metal brushes consist of wire having a diameter in the range of about 0.010 and 0.001 inches.
Claim 22
Dependent Claim
28 words
A radioactive static electricity eliminator according to claim 12 wherein the sloped side walls are sloped at an angle in the range from about 10* to about 20*.
Claim 23
Dependent Claim
28 words
A radioactive static electricity eliminator according to claim 12 wherein the metal grid is maintained in the range of about 1/4 to 1/2 inch above the radioactive foil.
Claim 24
Dependent Claim
30 words
A radioactive static electricity eliminator according to claim 12 wherein the tips of the brushes are maintained in the range of about 1/2 to 2 inches above the radioactive foil.
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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |