GB813915A - Continuous tone reversal development process - Google Patents

Continuous tone reversal development process


Publication number
GB813915A GB316856A GB316856A GB813915A GB 813915 A GB813915 A GB 813915A GB 316856 A GB316856 A GB 316856A GB 316856 A GB316856 A GB 316856A GB 813915 A GB813915 A GB 813915A
United Kingdom
Prior art keywords
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Application number
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Battelle Development Corp
Original Assignee
Battelle Development Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority to US813915XA priority Critical
Application filed by Battelle Development Corp filed Critical Battelle Development Corp
Publication of GB813915A publication Critical patent/GB813915A/en
Expired legal-status Critical Current



    • G03G13/00Electrographic processes using a charge pattern
    • G03G13/06Developing
    • G03G13/08Developing using a solid developer, e.g. powder developer


813,915. Electrostatic image development. BATTELLE DEVELOPMENT CORPORATION. Feb. 1, 1956 [Feb. 1, 1955], No. 3168/56. Drawings to Specification. Class 98(2) An electrostatic latent image is reversely developed by placing a conductive surface at 1/40-1/200 inch from the image and introducing electroscopic powder into the space between these two, the polarities of the image, conductive surface and powder, all being the same. The powder may be in the form of cloud which is given a charge by blowing it through a tube e.g. of metal, into the space above the image. When the image is formed by charging and exposing a photoconductive layer, the charges on the layer uncovered by the powder may be dissipated after development by uniform exposure to light, and then the image may be further developed by introducing powder of opposite polarity to that initially used, while the conductive surface is disconnected from its source of potential, so that further powder deposits on the original powder image. Specification 698,994 is referred to.
GB316856A 1955-02-01 1956-02-01 Continuous tone reversal development process Expired GB813915A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US813915XA true 1955-02-01 1955-02-01

Publications (1)

Publication Number Publication Date
GB813915A true GB813915A (en) 1959-05-27



Family Applications (1)

Application Number Title Priority Date Filing Date
GB316856A Expired GB813915A (en) 1955-02-01 1956-02-01 Continuous tone reversal development process

Country Status (2)

Country Link
DE (1) DE1026620B (en)
GB (1) GB813915A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1175991B (en) * 1959-10-15 1964-08-13 Wilhelm Ritzerfeld Apparatus for producing xerographic images
JPS5425830A (en) * 1977-07-29 1979-02-27 Ricoh Co Ltd Image forming method in electrophotographic copiers and others

Also Published As

Publication number Publication date
DE1026620B (en) 1958-03-20

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