US3683406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic incremental cascade developement system
Assignee: Xerox Corp
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Filing: 1969-12-30
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Granted: 1972-08-08
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Expires: 1989-12-30
Abstract
Abstract Electrographic recording device wherein development takes place at the recording station in such a manner that obscuring of the developed image by the developer unit is minimized. A developer trough or retaining structure constituting one part of the developing unit precedes the recording station. An oscillating magnet, forming another part of the developing unit and positioned adjacent the rear surface of the recording medium, effects movement of developer over latent electrostatic images printed upon the recording medium and its rapid return to the trough so that the developed image can be seen almost immediately.
Inventors
- 👤 Richard S Howell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:09
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/32; G03G15/321; G03G15/06; G03G15/08; G03G15/09
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
159 words
Apparatus for recording visible images on a charge retaining recording medium comprising; a. a recording head, b. means for moving said head through a scan cycle across one side of a recording medium while selectively pulsing said recording head to deposit a latent electrostatic charge pattern on said medium representative of information to be recorded, c. a receptacle adapted to support a quantity of magnetically attractable marking particles, said receptacle being positioned adjacent but out of the line of sight of the scan line made by said recording head on said recording medium, d. magnetic means positioned adjacent said recording head on the side of said recording medium opposite thereto for attracting marking particles out of said receptacle toward said recording medium and e. means for moving said magnetic means behind said recording medium to move said marking particles over the charge patterns formed during the scan of said recording head whereby said latent charge patterns are rendered visible.
Claim 2
Dependent Claim
159 words
Apparatus for recording visible images on a charge retaining recording medium comprising; a. a recording head, b. means for moving said head through a scan cycle across one side of a recording medium while selectively pulsing said recording head to deposit a latent electrostatic charge pattern on said medium representative of information to be recorded, c. a receptacle adapted to support a quantity of magnetically attractable marking particles, said receptacle being positioned adjacent but out of the line of sight of the scan line made by said recording head on said recording medium, d. magnetic means positioned adjacent said recording head on the side of said recording medium opposite thereto for attracting marking particles out of said receptacle toward said recording medium and e. means for moving said magnetic means behind said recording medium to move said marking particles over the charge patterns formed during the scan of said recording head whereby said latent charge patterns are rendered visible.
Claim 3
Dependent Claim
48 words
Apparatus according to claim 1 further including means to oscillate said magnetic means back to its original position so that excess marking particles are returned to said receptacLe after development of said latent charge patterns so as to make the developed charge patterns readily visible shortly after development.
Claim 4
Dependent Claim
89 words
Method of recording comprising the steps of: a. providing a charge-retentive recording medium; b. providing a charging station comprising electrostatic charging means for printing latent images on said recording medium; c. providing developer and retaining means therefor; d. moving said recording medium first past said retaining means and then past said recording station; e. providing magnetic means for presenting said developer to said recording medium while the latter is at said recording station, and f. oscillating said magnetic means to effect said presenting of developer to said recording medium.
Claim 5
Dependent Claim
89 words
Method of recording comprising the steps of: a. providing a charge-retentive recording medium; b. providing a charging station comprising electrostatic charging means for printing latent images on said recording medium; c. providing developer and retaining means therefor; d. moving said recording medium first past said retaining means and then past said recording station; e. providing magnetic means for presenting said developer to said recording medium while the latter is at said recording station, and f. oscillating said magnetic means to effect said presenting of developer to said recording medium.
Claim 6
Dependent Claim
28 words
The method according to claim 3 wherein, said magnetic means is disposed adjacent the surface of said recording medium opposite the surface on which said images are printed.
Claim 7
Dependent Claim
18 words
The method according to claim 3 wherein said magnetic means is oscillated through an angle of approximately 90*.
Claim 8
Dependent Claim
29 words
A method according to claim 3 wherein said magnetic means is oscillated through an angle of approximately 45* in one direction and then quickly returned to its original position.
Claim 9
Dependent Claim
97 words
Method of electrographic recording comprising the steps of: a. providing a charge retentive recording medium in the form of an elongated web; b. providing a charging station comprising electrostatic charging means for printing latent images on said recording medium; c. providing developer and retaining means therefor, said retaining means being disposed subadjacent said charging station; d. moving said recording medium upwardly past said retaining means and then past said charging means; e. presenting developer to said recording medium when said recording medium is at said recording station and; allowing non-attracted developer to return to said retaining means.
Claim 10
Dependent Claim
97 words
Method of electrographic recording comprising the steps of: a. providing a charge retentive recording medium in the form of an elongated web; b. providing a charging station comprising electrostatic charging means for printing latent images on said recording medium; c. providing developer and retaining means therefor, said retaining means being disposed subadjacent said charging station; d. moving said recording medium upwardly past said retaining means and then past said charging means; e. presenting developer to said recording medium when said recording medium is at said recording station and; allowing non-attracted developer to return to said retaining means.
Claim 11
Dependent Claim
114 words
Recording apparatus: a charge-retentive surface; means for containing magnetically attractable developer particles; means for placing latent images on said charge-retentive surface; means for transporting said charge-retentive surface past said means for placing latent images; magnetic means for moving developer from said containing means then presenting the developer to said charge-retentive surface while said charge-retentive surface is adjacent said means for placing latent images; said magnetic means and said developer containing means being disposed on opposite sides of said charge-retentive surface; and means for moving said magnetic means through an angle of approximately 45* in one direction and then in the opposite direction to thereby effect movement of unused developer back to said containing means.
Claim 12
Dependent Claim
114 words
Recording apparatus: a charge-retentive surface; means for containing magnetically attractable developer particles; means for placing latent images on said charge-retentive surface; means for transporting said charge-retentive surface past said means for placing latent images; magnetic means for moving developer from said containing means then presenting the developer to said charge-retentive surface while said charge-retentive surface is adjacent said means for placing latent images; said magnetic means and said developer containing means being disposed on opposite sides of said charge-retentive surface; and means for moving said magnetic means through an angle of approximately 45* in one direction and then in the opposite direction to thereby effect movement of unused developer back to said containing means.
Claim 13
Dependent Claim
112 words
Recording apparatus comprising: a charge-retentive surface; means for placing latent images on said charge-retentive surface; means for transporting said charge-retentive surface past said means for placing latent images; means for containing developer; magnetic means for attracting developer out of said containing means and presenting developer to said charge-retentive surface while said surface is disposed adjacent said means for placing latent images, said magnetic presenting means being disposed on a side of said charge-retentive surface opposite from said latent image placing means; and means for moving said developer presenting means from a non-developing position to a developing position whereby developer is moved from said containing means and into contact with said charge-retentive surface.
Claim 14
Dependent Claim
112 words
Recording apparatus comprising: a charge-retentive surface; means for placing latent images on said charge-retentive surface; means for transporting said charge-retentive surface past said means for placing latent images; means for containing developer; magnetic means for attracting developer out of said containing means and presenting developer to said charge-retentive surface while said surface is disposed adjacent said means for placing latent images, said magnetic presenting means being disposed on a side of said charge-retentive surface opposite from said latent image placing means; and means for moving said developer presenting means from a non-developing position to a developing position whereby developer is moved from said containing means and into contact with said charge-retentive surface.
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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |