US3981271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic brush type developer for use in an electrophotographic machine
Assignee: Fujifilm Business Innovation Corp
•
Filing: 1975-02-18
•
Granted: 1976-09-21
•
Expires: 1995-02-18
Abstract
Abstract A magnetic brush developer for use in electrophotographic copiers or the like, the developer comprising a magnet support shaft fixedly mounted with respect to the copier; a hollow, cylindrical magnet fixedly mounted on the support shaft; a hollow cylinder rotatably, concentrically mounted about the cylindrical magnet, the cylinder having at least one side, the one side including an annular support member for the cylinder where the support member is rotatably mounted on the magnet support shaft and projects inside of the cylinder to thereby provide a compact arrangement for the developer.
Inventors
- 👤 Ryuzo Okada
- 👤 Toshio Nagashima
- 👤 Hidetoshi Kito
- 👤 Takuzo Tsukamoto
- 👤 Michiharu Nakaguchi
- 👤 Kenichi Handa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:54
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G15/0921
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
92 words
A magnetic brush developer for use in electrophotographic copiers or the like, said developer comprising a magnet support shaft fixedly mounted with respect to said copier; a hollow, cylindrical magnet fixedly mounted on said support shaft; a hollow cylinder rotatably, concentrically mounted about said cylindrical magnet, said cylinder having at least one side, said one side including an annular support member for said cylinder where said support member is rotatably mounted on said magnet support shaft and projects inside of said cylindrical magnet to thereby provide a compact arrangement for said developer.
Claim 2
Dependent Claim
92 words
A magnetic brush developer for use in electrophotographic copiers or the like, said developer comprising a magnet support shaft fixedly mounted with respect to said copier; a hollow, cylindrical magnet fixedly mounted on said support shaft; a hollow cylinder rotatably, concentrically mounted about said cylindrical magnet, said cylinder having at least one side, said one side including an annular support member for said cylinder where said support member is rotatably mounted on said magnet support shaft and projects inside of said cylindrical magnet to thereby provide a compact arrangement for said developer.
Claim 3
Dependent Claim
57 words
A magnetic brush developer comprising a cylindrical magnet mounted on a magnet support shaft which is fixedly supported on a stationary structure; a cylinder rotatably mounted about said cylindrical magnet and having at least one side thereof supported on said magnet support shaft by means of a supporting member which is bent inwardly of said cylindrical magnet.
Claim 4
Dependent Claim
57 words
A magnetic brush developer comprising a cylindrical magnet mounted on a magnet support shaft which is fixedly supported on a stationary structure; a cylinder rotatably mounted about said cylindrical magnet and having at least one side thereof supported on said magnet support shaft by means of a supporting member which is bent inwardly of said cylindrical magnet.
Claim 5
Dependent Claim
108 words
A magnetic brush developer for use in electrophotographic copiers or the like, said developer comprising a magnet support shaft fixedly mounted with respect to said copier; a hollow, cylindrical magnet fixedly mounted on said support shaft, said magnet support shaft having an enlarged cylindrical, inner portion for mounting said hollow, cylindrical magnet; a hollow cylinder rotatably, concentrically mounted about said cylindrical magnet, said cylinder having at least one side, said one side including an annular support member for said cylinder where said support member is rotatably mounted on said magnet support shaft and projects inside of said cylindrical magnet to thereby provide a compact arrangement for said developer.
Claim 6
Dependent Claim
108 words
A magnetic brush developer for use in electrophotographic copiers or the like, said developer comprising a magnet support shaft fixedly mounted with respect to said copier; a hollow, cylindrical magnet fixedly mounted on said support shaft, said magnet support shaft having an enlarged cylindrical, inner portion for mounting said hollow, cylindrical magnet; a hollow cylinder rotatably, concentrically mounted about said cylindrical magnet, said cylinder having at least one side, said one side including an annular support member for said cylinder where said support member is rotatably mounted on said magnet support shaft and projects inside of said cylindrical magnet to thereby provide a compact arrangement for said developer.
References Cited (Backward Citations)
US2701765A
Cited
US2717080A
Cited
US2786440A
Cited
US2786439A
Cited
US3176652A
Cited
US3455276A
Cited
US3739749A
Cited
US3669072A
Cited
US3828730A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-21 | 1980-03-22 | 1980-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-21 | 1984-03-22 | 1984-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-21 | 1988-03-22 | 1988-09-21 | $7700.00 | Window Closed / Lapsed |