US3581149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corona discharging device for electrophotographic process
Assignee: Canon Inc
•
Filing: 1968-07-11
•
Granted: 1971-05-25
•
Expires: 1988-07-11
Abstract
Abstract Apparatus for use in imparting charge to a member including a conductive element having an end juxtaposed with the surface of the member being charged and a needle-form corona discharge electrode providing a discharge directed principally onto the conductive element. The corona discharge electrode is disposed in a plane substantially nonperpendicular to the member being charged and intersecting the plane containing the conductive element.
Inventors
- 👤 Hiroshi Tanaka
- 👤 Masayoshi Ishihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:22
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0291
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
82 words
Apparatus for use in imparting charge to the surface of a chargeable member comprising a conductive element having an end juxtaposed with said chargeable member surface, and an electrode providing corona discharge directed onto both said conductive element and said chargeable member surface and comprising an elongated body tapering to a corona discharge point, the longitudinal axis of said electrode body both intersecting a plane containing said conductive element and forming an acute angle with a plane containing said chargeable member surface.
Claim 2
Dependent Claim
82 words
Apparatus for use in imparting charge to the surface of a chargeable member comprising a conductive element having an end juxtaposed with said chargeable member surface, and an electrode providing corona discharge directed onto both said conductive element and said chargeable member surface and comprising an elongated body tapering to a corona discharge point, the longitudinal axis of said electrode body both intersecting a plane containing said conductive element and forming an acute angle with a plane containing said chargeable member surface.
Claim 3
Dependent Claim
21 words
The apparatus claimed in claim 1 wherein said electrode body longitudinal axis intersects said plane containing said conductive element substantially perpendicularly.
Claim 4
Dependent Claim
27 words
The apparatus claimed in claim 1 wherein said longitudinal axis of said electrode body intersects said plane containing said conductive element substantially at said conductive element end.
Claim 5
Dependent Claim
106 words
The apparatus claimed in claim 1 including in addition a conductor supporting said electrode, a further electrode supported by said conductor and comprising an elongated body tapering to a corona discharge point, and a further conductive element disposed on an opposite side of said support conductor from said first-mentioned conductive element and having an end juxtaposed with said surface, said further electrode providing corona discharge directed onto both said further conductive element and said member surface, the longitudinal axis of said second electrode body both intersecting a plane containing said further conductive element and forming an acute angle with said plane containing said chargeable member surface.
Claim 6
Dependent Claim
20 words
The apparatus claimed in claim 4 wherein said electrode and further electrode comprise sawteeth formed integrally with said support conductor.
Claim 7
Dependent Claim
28 words
The apparatus claimed in claim 4 wherein said electrode and further electrode comprise portions of a single electrode member supported in a transverse aperture in said support conductor.
Claim 8
Dependent Claim
83 words
The apparatus claimed in claim 1 including a further electrode disposed on an opposite side of said conductive element from said first-mentioned electrode and providing corona discharge onto both said conductive element and said member surface, said further electrode comprising an elongated body tapering to a corona discharge point, the longitudinal axis of said further electrode body both intersecting a plane containing said conductive element and forming an acute angle of from 0* to 40* with said plane containing said chargeable member surface.
Claim 9
Dependent Claim
21 words
The apparatus claimed in claim 4 wherein said electrode and further electrode are displaced from one another along said support conductor.
References Cited (Backward Citations)
US3133193A
Cited
US3303401A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |