Patent US3977898A successfully refreshed from Google Patents.
US3977898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for cleaning a support surface
Assignee: Xerox Corp
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Filing: 1975-07-23
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Granted: 1976-08-31
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Expires: 1995-07-23
Abstract
Abstract Method for cleaning liquid developer from upwardly moving support surfaces, such as reuable surfaces used for carrying latent electrostatic images. Surfaces are cleaned by a wiper blade and at least one scraper blade adapted to engage the support surface. The wiper blade acts upon the support surface upstream of the scraper blade.
Inventors
- 👤 Stephen C. P. Hwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:27
CPC Classifications
G; G03; G03G; G03G21/00; G03G21/0088
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
136 words
A method of cleaning liquid developer and debris from the uphill portion of a moving support surface in an electrostatographic apparatus comprising contacting the moving support surface having liquid developer thereon with a wiper blade and thereafter contacting the uphill portion of the support surface with at least one scraper blade downstream of the wiper blade to remove residual liquid developer and solid debris from said support surface, the scraper being a blade having a stem extending towards the tip of the blade in contact with the surface in the upstream direction of motion of the surface and the wiper being a blade having a stem extending towards the tip in contact with the surface in the downstream direction and pressed against the surface so that it is bent along its length in the downstream direction.
Claim 2
Independent Claim
136 words
A method of cleaning liquid developer and debris from the uphill portion of a moving support surface in an electrostatographic apparatus comprising contacting the moving support surface having liquid developer thereon with a wiper blade and thereafter contacting the uphill portion of the support surface with at least one scraper blade downstream of the wiper blade to remove residual liquid developer and solid debris from said support surface, the scraper being a blade having a stem extending towards the tip of the blade in contact with the surface in the upstream direction of motion of the surface and the wiper being a blade having a stem extending towards the tip in contact with the surface in the downstream direction and pressed against the surface so that it is bent along its length in the downstream direction.
Claim 3
Dependent Claim
59 words
The method of claim 1 further comprising contacting the support surface with a second scraper blade downstream from a first scraper blade to remove streaks of liquid developer from the support surface which have passed between the first scraper blade and the support surface due to the solid debris entrained between said first scraper blade and the support surface.
Claim 4
Dependent Claim
18 words
The method of Claim 1 wherein the scraper blades are of polyurethane of below 95 Shore A hardness.
Claim 5
Dependent Claim
31 words
The method of claim 1 comprising collecting the liquid developer removed from the support surface in a sump as the liquid developer accumulates on said surface and blades and drips therefrom.
References Cited (Backward Citations)
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Cited
US3634077A
Cited
US3660863A
Cited
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Cited
US3811914A
Cited
US3759220A
Cited
US3742551A
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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) | 1979-08-31 | 1980-03-01 | 1980-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-31 | 1984-03-01 | 1984-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-31 | 1988-03-01 | 1988-08-31 | $7700.00 | Window Closed / Lapsed |