Patent US3557752A successfully refreshed from Google Patents.
US3557752A
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Electrophotographic developing apparatus
Assignee: NILS L HAKANSON
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Filing: 1968-12-09
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Granted: 1971-01-26
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Expires: 1988-12-09
Abstract
Abstract Electrophotographic developing apparatus for applying a liquid developer to one surface of an electrophotographic recording element carrying the electrostatic image thereon so as to render the electrostatic image visible, the apparatus being adapted to apply liquid developer by a surface immersion technique and including edge control means arranged to contact portions of the recording element adjacent the side edges of the recording element as it moves past the reservoir containing the liquid developer, the edge control means preventing immersion of portions of the front surface of the recording element extending inwardly of the side edges for a predetermined distance whereby the back surface of the recording element is kept free from liquid developer.
Inventors
- 👤 Nils L Hakanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:56
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/10; G03G15/108
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
50 words
Apparatus according to claim 1, including a baffle member disposed in the liquid developer in said reservoir and between the front surface of said recording element and said inlet, whereby the flow of liquid developer being introduced at said inlet is distributed throughout at least a portion of said reservoir.
Claim 2
Dependent Claim
45 words
Apparatus according to claim 2, wherein said inlet is located at the bottom of said reservoir, and said baffle member comprises a flat plate, said plate extending substantially from one side of said recording element to the other and disposed beneath the front surface thereof.
Claim 3
Dependent Claim
23 words
Apparatus according to claim 1, wherein said backing member is arranged to vary in width depending upon the width of said recording element.
Claim 4
Dependent Claim
62 words
Apparatus according to claim 4, wherein said backing member comprises at least two parts, each of said parts having a plurality of elongate elements which interfit with corresponding elements on the other part, said parts being adapted for relative movement therebetween so as to permit the effective area of said backing member to vary depending upon the width of said recording element.
Claim 5
Dependent Claim
30 words
Apparatus according to claim 2, wherein said baffle member and said reservoir are electrically connected to ground potential, and said backing member is electrically connected to a direct current potential.
Claim 6
Dependent Claim
15 words
Apparatus according to claim 1, including means for adding additional liquid developer to said reservoir.
Claim 7
Dependent Claim
31 words
Apparatus according to claim 1, wherein said edge control means are adapted to cooperate with said backing member so as to hold said portions above the surface of said liquid developer.
Claim 8
Dependent Claim
63 words
Apparatus according to claim 1, wherein said edge control means comprise an elongate element extending along each side of said recording element, said elongate element having an upstanding rib portion extending above the surface of said liquid developer, said rib portion being adapted to prevent wicking of said liquid developer outwardly beyond said rib portion toward the side edges of said recording element.
Claim 9
Dependent Claim
36 words
Apparatus according to claim 1, wherein at least one of said edge control means is mounted for lateral movement relatively toward and away from the other to permit the handling of recording elements having different widths.
References Cited (Backward Citations)
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Cited
US3256855A
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US3345927A
Cited
US3435802A
Cited
US3367791A
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US3384051A
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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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |