US4907532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Endless belt development electrode for electrographic image
Assignee: 3M Co
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Filing: 1988-08-23
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Granted: 1990-03-13
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Expires: 2008-08-23
Abstract
Abstract A development apparatus is provided with a flat or concavely curved, endless belt development electrode to conform to a flat or cylindrical electrographic record member, respectively. Such a configuration provides increased toned quality as compared to conventional cylindrical development electrodes.
Inventors
- 👤 Valdis Mikelsons
- 👤 Lawrence M. Lucking
- 👤 Gregory L. Zwadlo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:23
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/06; G03G13/10; G03G15/00; G03G15/06; G03G15/10; G03G15/101
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
174 words
A development apparatus for the application of liquid toner to the surface of a cylindrical electrographic record bearing member comprising: an endless belt tensioned between at least two rollers and driven for movement with respect to said cylindrical record bearing member, said belt being positioned with respect to said record member such that a portion of said belt is in spaced, operative proximity to said record member to produce a development gap between said record bearing member and said belt and wherein the longitudinal axis of said portion of said belt in operative proximity of said cylindrical record member is parallel to the axis of said record member; a shroud surrounding said belt and said drive rollers for containing said liquid toner; means for providing a continuous supply of said liquid toner to said development gap forcing said liquid toner into said development gap; and a base supporting said belt opposite said record member for maintaining the shape of said belt and providing a uniform development gap between said belt and said record member.
Claim 2
Dependent Claim
174 words
A development apparatus for the application of liquid toner to the surface of a cylindrical electrographic record bearing member comprising: an endless belt tensioned between at least two rollers and driven for movement with respect to said cylindrical record bearing member, said belt being positioned with respect to said record member such that a portion of said belt is in spaced, operative proximity to said record member to produce a development gap between said record bearing member and said belt and wherein the longitudinal axis of said portion of said belt in operative proximity of said cylindrical record member is parallel to the axis of said record member; a shroud surrounding said belt and said drive rollers for containing said liquid toner; means for providing a continuous supply of said liquid toner to said development gap forcing said liquid toner into said development gap; and a base supporting said belt opposite said record member for maintaining the shape of said belt and providing a uniform development gap between said belt and said record member.
Claim 3
Dependent Claim
48 words
A development apparatus according to claim 1 wherein said base includes a concave surface adjacent said record member to conform to said cylindrical record member, said belt is magnetically attractive and said base includes magnets to draw said belt into conformity with said concave surface of said base.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-12 | 1993-09-11 | 1994-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-12 | 1997-09-11 | 1998-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-12 | 2001-09-11 | 2002-03-13 | $7700.00 | Window Closed / Lapsed |