Patent US3722994A successfully refreshed from Google Patents.
US3722994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and device for removing developing liquid
Assignee: Canon Inc
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Filing: 1970-05-25
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Granted: 1973-03-27
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Expires: 1990-05-25
Abstract
Abstract A method and device used with an electronic photocopying apparatus and for removing any residual developing solution from a photosensitive member by the use of a corona discharger to thereby provide a perfect copy of an original image.
Inventors
- 👤 H Tanaka
- 👤 T Takahashi
- 👤 H Katayama
- 👤 T Saito
- 👤 S Tsukada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:32
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/10; G03G15/11
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
57 words
A method of removing excessive developing liquid from the surface of a photosensitive member comprising: applying corona discharge from a corona discharger to said surface of the photosensitive member bearing said excessive developing liquid to deposit electric charge of a predetermined polarity uniformly thereon, and drawing off excessive developing liquid from said surface of the photosensitive member.
Claim 2
Independent Claim
57 words
A method of removing excessive developing liquid from the surface of a photosensitive member comprising: applying corona discharge from a corona discharger to said surface of the photosensitive member bearing said excessive developing liquid to deposit electric charge of a predetermined polarity uniformly thereon, and drawing off excessive developing liquid from said surface of the photosensitive member.
Claim 3
Dependent Claim
24 words
A method of removing excessive developing liquid as in claim 1 wherein said excessive developing liquid is drawn off said photosensitive member by suction.
Claim 4
Dependent Claim
34 words
A method of removing excessive developing liquid as in claim 1 wherein said excessive developing liquid is drawn off by sucking developing liquid at a predetermined height above said surface of the photosensitive member.
Claim 5
Dependent Claim
29 words
A method of removing excessive developing liquid as in claim 1 wherein said excessive developing liquid is drawn off by moving said corona discharger relative to said photosensitive member.
Claim 6
Dependent Claim
26 words
A method of removing excessive developing liquid as in claim 4 wherein said relative movement is in a direction whereby said developing liquid is dripped off.
Claim 7
Independent Claim
69 words
A method of removing excessive developing liquid from the surface of a photosensitive member bearing an electrophotographic image visualized with toner of one polarity comprising: applying corona discharge from a corona discharger to said surface of the photosensitive member to deposit electric charge of the same polarity as said one polarity of said toner uniformly thereon, and drawing off excessive developing liquid from said surface of the photosensitive member.
Claim 8
Independent Claim
69 words
A method of removing excessive developing liquid from the surface of a photosensitive member bearing an electrophotographic image visualized with toner of one polarity comprising: applying corona discharge from a corona discharger to said surface of the photosensitive member to deposit electric charge of the same polarity as said one polarity of said toner uniformly thereon, and drawing off excessive developing liquid from said surface of the photosensitive member.
Claim 9
Dependent Claim
24 words
A method of removing excessive developing liquid as in claim 6 wherein said excessive developing liquid is drawn off said photosensitive member by suction.
Claim 10
Dependent Claim
34 words
A method of removing excessive developing liquid as in claim 6 wherein said excessive developing liquid is drawn off by sucking developing liquid at a predetermined height above said surface of the photosensitive member.
Claim 11
Dependent Claim
29 words
A method of removing excessive developing liquid as in claim 6 wherein said excessive developing liquid is drawn off by moving said corona discharger relative to said photosensitive member.
Claim 12
Independent Claim
53 words
A method of removing excessive developing liquid from the surface of a photosensitive member comprising: applying corona discharge from a corona discharger to said photosensitive member to decrease the effective surface tension of said developing liquid thereon and to provide same with a high degree of fluidity and drawing off excessive developing liquid.
Claim 13
Independent Claim
53 words
A method of removing excessive developing liquid from the surface of a photosensitive member comprising: applying corona discharge from a corona discharger to said photosensitive member to decrease the effective surface tension of said developing liquid thereon and to provide same with a high degree of fluidity and drawing off excessive developing liquid.
Claim 14
Independent Claim
52 words
A method of removing excessive developing liquid from the surface of a photosensitive member comprising: applying corona discharge from a corona discharger to said photosensitive member to depress the surface of developing liquid thereon, and drawing off at least a portion of the developing liquid displaced by the depression of said surface.
Claim 15
Independent Claim
52 words
A method of removing excessive developing liquid from the surface of a photosensitive member comprising: applying corona discharge from a corona discharger to said photosensitive member to depress the surface of developing liquid thereon, and drawing off at least a portion of the developing liquid displaced by the depression of said surface.
Claim 16
Dependent Claim
58 words
In a copying device, an apparatus for removing excessive developing liquid from the surface of a photosensitive member comprising: corona discharge means positioned relative to said photosensitive member bearing said excessive developing liquid for depositing electric charge of a predetermined polarity uniformly thereon, and means for drawing off excessive developing liquid from said surface of the photosensitive member.
Claim 17
Dependent Claim
58 words
In a copying device, an apparatus for removing excessive developing liquid from the surface of a photosensitive member comprising: corona discharge means positioned relative to said photosensitive member bearing said excessive developing liquid for depositing electric charge of a predetermined polarity uniformly thereon, and means for drawing off excessive developing liquid from said surface of the photosensitive member.
Claim 18
Dependent Claim
36 words
In a copying device, an apparatus as in claim 12 wherein said means for drawing off excessive developing liquid includes vacuum suction means for forcibly sucking removable developing liquid from said surface of the photosensitive member.
Claim 19
Dependent Claim
33 words
In a copying device, an apparatus as in claim 12 wherein said means for drawing off excessive developing liquid includes means causing relative movement between said corona discharge means and said photosensitive means.
Claim 20
Dependent Claim
36 words
In a copying device, an apparatus as in claim 14 further comprising means establishing said relative movement between said photosensitive means and said corona discharge means in a direction whereby said developing liquid is dripped off.
Claim 21
Dependent Claim
70 words
In a copying device, an apparatus for removing excessive developing liquid from the surface of a photosensitive member bearing an electrophotographic image visualized with toner of one polarity comprising: corona discharge means positioned relative to said photosensitive member for depositing electric charge of the same polarity as said one polarity of said toner uniformly thereon, and means for drawing off excessive developing liquid from said surface of the photosensitive member.
Claim 22
Dependent Claim
70 words
In a copying device, an apparatus for removing excessive developing liquid from the surface of a photosensitive member bearing an electrophotographic image visualized with toner of one polarity comprising: corona discharge means positioned relative to said photosensitive member for depositing electric charge of the same polarity as said one polarity of said toner uniformly thereon, and means for drawing off excessive developing liquid from said surface of the photosensitive member.
Claim 23
Dependent Claim
36 words
In a copying device, an apparatus as in claim 16 wherein said means for drawing off excessive developing liquid includes vacuum suction means for forcibly sucking removable developing liquid from said surface of the photosensitive member.
Claim 24
Dependent Claim
33 words
In a copying device, an apparatus as in claim 16 wherein said means for drawing off excessive developing liquid includes means causing relative movement between said corona discharge means and said photosensitive means.
Claim 25
Dependent Claim
56 words
In a copying device, an apparatus for removing excessive developing liquid from the surface of a photosensitive member comprising: corona discharge means positioned relative to said photosensitive member for decreasing the effective surface tension of said developing liquid thereon and providing same with a high degree of fluidity, and means for drawing off excessive developing liquid.
Claim 26
Dependent Claim
56 words
In a copying device, an apparatus for removing excessive developing liquid from the surface of a photosensitive member comprising: corona discharge means positioned relative to said photosensitive member for decreasing the effective surface tension of said developing liquid thereon and providing same with a high degree of fluidity, and means for drawing off excessive developing liquid.
Claim 27
Dependent Claim
56 words
In a copying device, an apparatus for removing excessive developing liquid from the surface of a photosensitive member comprising: corona discharge means positioned relative to said photosensitive member for depressing the surface of said developing liquid, and means for drawing off at least a portion of the developing liquid displaced by the depression of said surface.
Claim 28
Dependent Claim
56 words
In a copying device, an apparatus for removing excessive developing liquid from the surface of a photosensitive member comprising: corona discharge means positioned relative to said photosensitive member for depressing the surface of said developing liquid, and means for drawing off at least a portion of the developing liquid displaced by the depression of said surface.
Claim 29
Independent Claim
55 words
A method of removing excessive developing liquid from the surface of a photosensitive member comprising: applying corona discharge from a corona discharger to said photosensitive member to subject said surface bearing said excessive developing liquid to electric charge of a predetermined polarity, and drawing off excessive developing liquid from said surface of said photosensitive member.
Claim 30
Independent Claim
55 words
A method of removing excessive developing liquid from the surface of a photosensitive member comprising: applying corona discharge from a corona discharger to said photosensitive member to subject said surface bearing said excessive developing liquid to electric charge of a predetermined polarity, and drawing off excessive developing liquid from said surface of said photosensitive member.
Claim 31
Dependent Claim
20 words
A method of removing excessive developing liquid as in claim 21, wherein said corona discharge is a DC corona discharge.
Claim 32
Dependent Claim
59 words
In a copying device, an apparatus for removing excessive developing solution from the surface of a photosensitive member comprising: corona discharge means positioned relative to said photosensitive member for subjecting said surface bearing said excessive developing liquid to electric charge of a predetermined polarity, and means for drawing off excessive developing liquid from said surface of the photosensitive member.
Claim 33
Dependent Claim
59 words
In a copying device, an apparatus for removing excessive developing solution from the surface of a photosensitive member comprising: corona discharge means positioned relative to said photosensitive member for subjecting said surface bearing said excessive developing liquid to electric charge of a predetermined polarity, and means for drawing off excessive developing liquid from said surface of the photosensitive member.
Claim 34
Dependent Claim
20 words
In a copying device, an apparatus according to claim 23, wherein said corona discharge means generates a DC corona discharge.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |