US3863603A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic brush roll having resilient polymeric surface
Assignee: International Business Machines Corp
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Filing: 1974-01-07
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Granted: 1975-02-04
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Expires: 1994-01-07
Abstract
Abstract A magnetic brush roll of an electrostatic reproduction machine is formed of a non-magnetic core with a resilient polymeric material such as polyurethane, for example, on its surface. The polyurethane surface is textured to provide a desired roughness, is non-abrasive, and is abrasion resistant. Carbon is added to the polyurethane to render it conductive.
Inventors
- 👤 Lawrence Webb Buckley
- 👤 Raymond Alex Daniels
- 👤 James Dewayne Froula
- 👤 Arthur Holt Knight
- 👤 Dale Cliffton Stapleton
- 👤 George Thomas Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:42
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G15/0921; G03G15/0928
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
147 words
IN AN ELECTROPHOTOGRAPHIC DEVELOPMENT APPRATRUS OF THE MAGNETIC BRUSH TYPE HAVING: A SURFACE ON WHICH A LATENT IMAGE IS FORMED; A ROTATABLY MOUNTED HOLLOW ROLL INCLUDNG A CORE OF NONMAGNETIC MATERIAL AND A RESILIENT POLYMERIC MATERIAL SECURED TO SAID CORE TO FORM THE SURFACE OF SAID ROLL; SAID RESILIENT POLYMERIC MATERIAL HAVING AT LEAST ITS SURFACE ELECTRICALLY CONDUCTIVE; SAID RESILIENT POLYMERIC MATERIAL HAVING ITS SURFACE NONABRASIVE, ABRASION RESISTANT, AND ROUGH; MAGNETIC MEANS DISPOSED WITHIN SAID CORE FOR CREATING A MAGNETIC FIELD IN THE PATH OF THE PERIPHERY OF SAID ROLL; AND MEANS TO BRING A DEVELOPER MATERIAL INTO CONTACT WITH THE SURFACE OF SAID RESILIENT POLYMERIC MATERIAL OF SAID ROOL, SAID ROLL BEING DISPOSED ADJACENT SAID SURFACE ON WHICH THE LATENT IMAGE IS FORMED SO THAT SAID ROLL CAN TRANSPORT THE DEVELOPER MATERIAL IN A BRUSH-LIKE CONFIGURATION TO THE SURFACE ON WHICH THE LATENT IMAGE IS FORMED.
Claim 2
Dependent Claim
147 words
IN AN ELECTROPHOTOGRAPHIC DEVELOPMENT APPRATRUS OF THE MAGNETIC BRUSH TYPE HAVING: A SURFACE ON WHICH A LATENT IMAGE IS FORMED; A ROTATABLY MOUNTED HOLLOW ROLL INCLUDNG A CORE OF NONMAGNETIC MATERIAL AND A RESILIENT POLYMERIC MATERIAL SECURED TO SAID CORE TO FORM THE SURFACE OF SAID ROLL; SAID RESILIENT POLYMERIC MATERIAL HAVING AT LEAST ITS SURFACE ELECTRICALLY CONDUCTIVE; SAID RESILIENT POLYMERIC MATERIAL HAVING ITS SURFACE NONABRASIVE, ABRASION RESISTANT, AND ROUGH; MAGNETIC MEANS DISPOSED WITHIN SAID CORE FOR CREATING A MAGNETIC FIELD IN THE PATH OF THE PERIPHERY OF SAID ROLL; AND MEANS TO BRING A DEVELOPER MATERIAL INTO CONTACT WITH THE SURFACE OF SAID RESILIENT POLYMERIC MATERIAL OF SAID ROOL, SAID ROLL BEING DISPOSED ADJACENT SAID SURFACE ON WHICH THE LATENT IMAGE IS FORMED SO THAT SAID ROLL CAN TRANSPORT THE DEVELOPER MATERIAL IN A BRUSH-LIKE CONFIGURATION TO THE SURFACE ON WHICH THE LATENT IMAGE IS FORMED.
Claim 3
Dependent Claim
21 words
The apparatus according to claim 1 in which said resilient polymeric material of said roll is electrically conductive throughout its entirety.
Claim 4
Dependent Claim
20 words
The apparatus according to claim 2 in which said resilient polymeric material comprises a single homogeneous layer on said core.
Claim 5
Dependent Claim
24 words
The apparatus according to claim 3 in which said resilient polymeric material has a hardness no greater than 95 on a Shore A durometer.
Claim 6
Dependent Claim
20 words
The apparatus according to claim 4 in which said layer of resilient polymeric material is at least 0.010 inch thick.
Claim 7
Dependent Claim
23 words
The apparatus according to claim 5 in which said layer of resilient polymeric material is polyurethane having an electrically conductive material dispersed throughout.
Claim 8
Dependent Claim
36 words
The apparatus according to claim 2 in which said resilient polymeric material comprises: a first homogeneous layer secured to said core; and a second layer secured to said first layer, said second layer being electrically conductive.
Claim 9
Dependent Claim
26 words
The apparatus according to claim 7 in which: said resilient polymeric material is polyurethane; and said second layer includes an electrically conductive material in said polyurethane.
Claim 10
Dependent Claim
24 words
The apparatus according to claim 8 in which said resilient polymeric material has a hardness no greater than 95 on a Shore A durometer.
Claim 11
Dependent Claim
14 words
The apparatus according to claim 1 in which said resilient polymeric material is polyurethane.
References Cited (Backward Citations)
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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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |