Patent US3986773A successfully refreshed from Google Patents.
US3986773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apertured conveyor belt for transporting copy material
Assignee: Hoechst AG
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Filing: 1974-10-08
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Granted: 1976-10-19
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Expires: 1994-10-08
Abstract
Abstract A conveyor belt for use in electrophotographic copying apparatus, which conveyor belt has a plurality of apertures therein and comprises electrically insulating material that can be electrostatically charged, the size and the distribution of the apertures being such that sheet material on which a copy is to be produced can adhere by electrostatic attraction to the belt when the belt is installed in the apparatus and such that the tendency of the belt to impair the copy is less than that for a belt without apertures.
Inventors
- 👤 Gerhard Marx
- 👤 Gunter Kramer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:01
CPC Classifications
G; G03; G03G; G03G15/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
143 words
In an electrophotographic copying apparatus having a continuous conveyor belt for transporting a copy material and means for electrostatically charging an underside of said conveyor belt, the improvement in which said conveyor belt includes an electrically insulating web of continuous length having a plurality of apertures extending through the web from an upper side to a lower side, said both sides are electrostatically chargeable, said apertures avoiding undesirable strip images of the conveyor belt on the copy material and have a total surface area of at least 30% of the total area of the conveyor belt and are arranged in a matrix of inclined rows to the continuous length direction of the web, the connecting lines of the central points of the apertures in the inclined rows of the matrix defining an angle of approximately 45° with said length direction of the web.
Claim 2
Dependent Claim
143 words
In an electrophotographic copying apparatus having a continuous conveyor belt for transporting a copy material and means for electrostatically charging an underside of said conveyor belt, the improvement in which said conveyor belt includes an electrically insulating web of continuous length having a plurality of apertures extending through the web from an upper side to a lower side, said both sides are electrostatically chargeable, said apertures avoiding undesirable strip images of the conveyor belt on the copy material and have a total surface area of at least 30% of the total area of the conveyor belt and are arranged in a matrix of inclined rows to the continuous length direction of the web, the connecting lines of the central points of the apertures in the inclined rows of the matrix defining an angle of approximately 45° with said length direction of the web.
Claim 3
Dependent Claim
39 words
The conveyor belt as claimed in claim 1, wherein the apertures are circular with a diameter of approximately 8 mm and the apertures are additionally arranged in rows normal and parallel respectively to said length direction of the web.
Claim 4
Dependent Claim
22 words
The conveyor belt as claimed in claim 2, wherein adjacent parallel rows are staggered with respect to the apertures in each row.
Claim 5
Dependent Claim
22 words
The conveyor belt as claimed in claim 2, wherein adjacent normal rows are staggered with respect to the apertures in each row.
Claim 6
Dependent Claim
34 words
The conveyor belt as claimed in claim 3, wherein the spacing in said length direction of the web between the central points of adjacent apertures of adjoining normal and staggered rows is 8 mm.
Claim 7
Dependent Claim
36 words
The conveyor belt as claimed in claim 4, wherein the spacing normal to said length direction of the web between the central points of adjacent apertures of adjoining parallel and staggered rows is approximately 8 mm.
Claim 8
Dependent Claim
21 words
The conveyor belt as claimed in claim 1, wherein the width of the belt is from 4 cm to 10 cm.
Claim 9
Dependent Claim
17 words
The conveyor belt as claimed in claim 1, wherein the width of the belt is 6.5 cm.
Claim 10
Dependent Claim
20 words
The conveyor belt as claimed in claim 7, wherein the belt has a thickness from 10 μ to 2 mm.
Claim 11
Dependent Claim
17 words
The conveyor belt as claimed in claim 7, wherein the belt has a thickness of 50 μ.
Claim 12
Dependent Claim
17 words
The conveyor belt as claimed in claim 1, wherein the belt is comprised of a plastics material.
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) | 1979-10-19 | 1980-04-19 | 1980-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-19 | 1984-04-19 | 1984-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-19 | 1988-04-19 | 1988-10-19 | $7700.00 | Window Closed / Lapsed |