US3959690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corona discharge element
Assignee: Hoechst AG
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Filing: 1974-10-04
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Granted: 1976-05-25
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Expires: 1994-10-04
Abstract
Abstract A corona discharge element, process for manufacturing the corona discharge element and a corona device including the corona discharge element. The element is a metal strip with peaks on one side thereof alternately positioned in the plane of one side of the strip and then the other with the peaks having the shape of a four-sided pyramid and one side of the pyramid lying in the plane of the surface of the strip. The process includes grinding the teeth of a saw blade to assume pyramidal shape. The corona device includes a frame, a corona discharge element, laminar auxiliary electrodes and grid electrode in which the element, laminar electrodes and grid electrode are electrically insulated from each other and have electrical connections thereto.
Inventors
- 👤 Klaus Leibrecht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:05
CPC Classifications
H; H05; H05F; H05F3/00; H05F3/04; G; G03; G03G; G03G15/00; G03G15/02; G03G15/0291; H01; H01T; H01T19/00; H01T19/04; G03G2215/00; G03G2215/02; G03G2215/026; G03G2215/028
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
118 words
A corona discharge element consisting of a planar metal saw blade, two longitudinal edges of which are provided with two sets of pointed projections, the peaks of one set of projections lying in a plane which contains one side of the blade and the peaks of the other set of projections lying in another plane which contains the other side of the blade, said discharge element comprising: a. a common plane in which the peaks of all of the projections are lying and which is perpendicular to said planes, b. said projections have the shape of a four-sided pyramid, the base of which is rectangular, c. said bases of adjacent projections are adjoining without clearance between each projection.
Claim 2
Dependent Claim
118 words
A corona discharge element consisting of a planar metal saw blade, two longitudinal edges of which are provided with two sets of pointed projections, the peaks of one set of projections lying in a plane which contains one side of the blade and the peaks of the other set of projections lying in another plane which contains the other side of the blade, said discharge element comprising: a. a common plane in which the peaks of all of the projections are lying and which is perpendicular to said planes, b. said projections have the shape of a four-sided pyramid, the base of which is rectangular, c. said bases of adjacent projections are adjoining without clearance between each projection.
Claim 3
Dependent Claim
53 words
The corona discharge element according to claim 1, in which the peaks are alternately positioned in the plane of the left and of the right side of the metal saw blade, with one of the four flat sides of the pyramid lying in the plane of the respective side of the metal blade.
Claim 4
Dependent Claim
35 words
The corona discharge element according to claim 1, in which the lateral distance between a peak in one set and the nearest peak in the other set is confined to the thickness of the blade.
Claim 5
Dependent Claim
24 words
The corona discharge element according to claim 1, in which the distance between the peaks of adjacent projections in a set is substantially constant.
Claim 6
Dependent Claim
99 words
A process for the manufacture of a corona discharge element defining a conductive metal blade of determined thickness comprising forming on said blade a plurality of pointed projections which extend laterally beyond the boundary planes in two rows on the upper longitudinal edge of the blade whereby in each of the boundary planes of the blade one row of pyramidal peaks is provided and machining said peaks of both rows to the same height wherein the distance between rows of opposed peaks is confined to the thickness of the blade and said peaks of the opposed rows are staggered.
Claim 7
Dependent Claim
99 words
A process for the manufacture of a corona discharge element defining a conductive metal blade of determined thickness comprising forming on said blade a plurality of pointed projections which extend laterally beyond the boundary planes in two rows on the upper longitudinal edge of the blade whereby in each of the boundary planes of the blade one row of pyramidal peaks is provided and machining said peaks of both rows to the same height wherein the distance between rows of opposed peaks is confined to the thickness of the blade and said peaks of the opposed rows are staggered.
Claim 8
Dependent Claim
31 words
The process of claim 5, including forming the projections as four-sided pyramids with the outermost side of each pyramid being flat and aligned with the respective boundary plane of the blade.
References Cited (Backward Citations)
US2117586A
Cited
US3718029A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-25 | 1979-11-24 | 1980-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-25 | 1983-11-24 | 1984-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-25 | 1987-11-24 | 1988-05-25 | $7700.00 | Window Closed / Lapsed |