US3665181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heated corona charging unit
Assignee: Dennison Manufacturing Co
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Filing: 1970-01-14
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Granted: 1972-05-23
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Expires: 1990-01-14
Abstract
Abstract A corona charging unit for use in an electro-photographic copier apparatus wherein such unit utilizes a heater mounted on or nearby such unit so as to raise the operating temperature thereof above its normal operating temperature so as to eliminate streaking in the visible image produced by such copier apparatus.
Inventors
- 👤 Harold W Cobb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:53
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0291
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
175 words
A corona charging unit for use in an electro-photographic copier apparatus and located at a position adjacent an exposure station thereof, said unit comprising a housing structure having means for permitting an electrophotographic plate to be moved therethrough; corona charging wires positioned in said housing structure so as to be adjacent opposite sides of said electro-photographic plate as it moves through said unit; power supply means for supplying voltage to said corona charging wires for charging the photoconductive surface of said plate substantially immediately prior to exposure in said copier apparatus; an opening provided in said housing structure; duct means mounted on said housing structure so as to enclose said opening for conveying heated air through said opening into the interior of said housing structure; and means for supplying heated air to said duct means for heating said corona charging unit to a temperature above its normal operating temperature simultaneously with the charging of said photoconductive surface for eliminating streaking of a visible image obtained on said electro-photographic plate during operation of said copier apparatus.
Claim 2
Dependent Claim
175 words
A corona charging unit for use in an electro-photographic copier apparatus and located at a position adjacent an exposure station thereof, said unit comprising a housing structure having means for permitting an electrophotographic plate to be moved therethrough; corona charging wires positioned in said housing structure so as to be adjacent opposite sides of said electro-photographic plate as it moves through said unit; power supply means for supplying voltage to said corona charging wires for charging the photoconductive surface of said plate substantially immediately prior to exposure in said copier apparatus; an opening provided in said housing structure; duct means mounted on said housing structure so as to enclose said opening for conveying heated air through said opening into the interior of said housing structure; and means for supplying heated air to said duct means for heating said corona charging unit to a temperature above its normal operating temperature simultaneously with the charging of said photoconductive surface for eliminating streaking of a visible image obtained on said electro-photographic plate during operation of said copier apparatus.
Claim 3
Dependent Claim
25 words
A corona charging unit in accordance with claim 1, wherein said opening is formed as an elongated slot along one side of said housing structure.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |