US3635196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatically controlled seal
Assignee: Xerox Corp
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Filing: 1969-12-30
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Granted: 1972-01-18
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Expires: 1989-12-30
Abstract
Abstract Seal structure for xerographic developer apparatus. The development apparatus contemplated is of the type commonly referred to as a cascade development system wherein fine developer particles are moved in an upwardly direction and allowed to fall or be cascaded onto a xerographic surface and subsequently returned to the developer sump. The seal is characterized by being inflatable in order to block the space between the housing structure and the recording surface, after movement of the recording surface has commenced.
Inventors
- 👤 George N Tsilibes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:33
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0801
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
128 words
In a xerographic machine of the type utilizing a development system wherein a powder image is developed on a xerographic surface by presenting carrier particles and toner mateRial to the surface and structure for effecting return of unused particles to a developer sump the improvement comprising, in combination: housing structure enclosing at least a portion of the xerographic surface, said housing structure being spaced from said surface; seal means disposed intermediate said surface and said housing structure; and means for moving said seal means into engagement with said xerographic surface for impeding emission of particles and material from said housing structure and moving said seal means out of engagement with said surface to permit initial movement of said surface without the retarding friction due to the seal means.
Claim 2
Dependent Claim
128 words
In a xerographic machine of the type utilizing a development system wherein a powder image is developed on a xerographic surface by presenting carrier particles and toner mateRial to the surface and structure for effecting return of unused particles to a developer sump the improvement comprising, in combination: housing structure enclosing at least a portion of the xerographic surface, said housing structure being spaced from said surface; seal means disposed intermediate said surface and said housing structure; and means for moving said seal means into engagement with said xerographic surface for impeding emission of particles and material from said housing structure and moving said seal means out of engagement with said surface to permit initial movement of said surface without the retarding friction due to the seal means.
Claim 3
Dependent Claim
14 words
Structure as specified in claim 1 wherein said seal means comprises an extensible means.
Claim 4
Dependent Claim
38 words
Structure according to claim 2 wherein said extensible means comprises inflatable seals extending at least along the sides of said housing structure and including means for selectively supplying air to said seals under pressure for effecting said engagement.
Claim 5
Dependent Claim
52 words
Structure according to claim 2 wherein said extensible means comprises a first pair of inflatable seals extending along the sides of said housing structure and a second pair of inflatable seals intermediate said first pair of inflatable seals at the ends thereof and including means for selectively supplying air to said seals.
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) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |