Patent US4474457A successfully refreshed from Google Patents.
US4474457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Platen having anti-static properties for use with a document transport system
Assignee: Xerox Corp
•
Filing: 1982-09-21
•
Granted: 1984-10-02
•
Expires: 2002-09-21
Abstract
Abstract A document transport system for a copier has associated with it a platen having anti-static properties. A platen glass surface is coated with an optically transmissive grounded coating which serves to dissipate electrostatic fields which occur as a consequence of the movement of the document across the platen surface. In one embodiment wherein the transport system includes rollers which frictionally engage and move the document across the platen, the conductive coating is omitted in areas generally underlying the rollers.
Inventors
- 👤 Russell L. Phelps
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:27
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/60; G03G15/605
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
80 words
In a document transport system wherein localized document transport means are positioned in operative frictional engagement with a document overlying a platen so as to move said document into an exposure position and to remove said document from said platen following exposure, an improved platen comprising a glass base coated with at least a layer of grounded, optically transmissive, conductive material, said conductive material being omitted in an area generally underlying the frictional contact area of said localized transport means.
Claim 2
Dependent Claim
80 words
In a document transport system wherein localized document transport means are positioned in operative frictional engagement with a document overlying a platen so as to move said document into an exposure position and to remove said document from said platen following exposure, an improved platen comprising a glass base coated with at least a layer of grounded, optically transmissive, conductive material, said conductive material being omitted in an area generally underlying the frictional contact area of said localized transport means.
Claim 3
Dependent Claim
20 words
The document transport system of claim 1 wherein said conductive material is a 50 Å coating of indium tin oxide.
Claim 4
Dependent Claim
40 words
The document transport system of claim 2 wherein said platen has a layer of magnesium fluoride between said glass base and said conductive layer, the magnesium fluoride also being eliminated in areas conforming to omitted areas of the conductive material.
Claim 5
Dependent Claim
17 words
The document transport system of claim 1 wherein said localized transport system comprises a plurality of rollers.
References Cited (Backward Citations)
US3094436A
Cited
US3949259A
Cited
US3889943A
Cited
US4128303A
Cited
US4127789A
Cited
US4231561A
Cited
US4171128A
Cited
US4252841A
Cited
US4213603A
Cited
US4183519A
Cited
JPS5565637A
Cited
JPS55164838A
Cited
US4248687A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-02 | 1988-04-02 | 1988-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-02 | 1992-04-02 | 1992-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-02 | 1996-04-02 | 1996-10-02 | $7700.00 | Window Closed / Lapsed |