Patents by Inventor Milan Stolka
Milan Stolka has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 4758488Abstract: A photoresponsive imaging member comprised of a supporting substrate, a photogenerating layer, and a hole transporting layer comprised of a polysilylene stabilized with a component possessing an ionization potential equal to or greater than the polysilylene.Type: GrantFiled: August 24, 1987Date of Patent: July 19, 1988Assignee: Xerox CorporationInventors: Gordon E. Johnson, Milan Stolka, Ronald J. Weagley, Frederick J. Roberts, Jr., Santokh S. Badesha
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Patent number: 4758487Abstract: Disclosed is a photoresponsive imaging member comprised of certain hydrogenated, or halogenated amorphous boron.Type: GrantFiled: November 24, 1986Date of Patent: July 19, 1988Assignee: Xerox CorporationInventors: Milan Stolka, Damodar M. Pai
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Patent number: 4618551Abstract: Disclosed is a polysilylene hole transporting compound for use in layered imaging members comprised of ##STR1## wherein R.sub.1,R.sub. 2, R.sub.3, R.sub.4, R.sub.5, and R.sub.6 are independently selected from the group consisting of alkyl, aryl, substituted alkyl, substituted aryl, and alkoxy; and n, m, and p are numbers that represent the percentage of the monomer unit in the total polymer compound.Type: GrantFiled: January 25, 1985Date of Patent: October 21, 1986Assignee: Xerox CorporationInventors: Milan Stolka, Damodar M. Pai, Thomas W. Smith, James M. Duff, Rafik O. Loutfy
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Patent number: 4588666Abstract: Disclosed is a hole transporting molecule comprised of alkoxy derivatives of tetra phenyl biphenyl diamine of the following formula: ##STR1## wherein R.sub.1 is independently selected from the group consisting of hydrogen, ortho alkoxy, meta alkoxy, para alkoxy, ortho alkyl, meta alkyl, para alkyl, 3,5-dialkoxy, 2,4-dialkoxy, and 2,5-dialkoxy; and R.sub.2 is selected from the group consisting of ortho alkoxy, meta alkoxy, para alkoxy, 3,5-dialkoxy, 2,4-dialkoxy, and 2,5-dialkoxy; and layered imaging member containing therein the aforementioned alkoxydiamine derivatives and a photoconductive layer.Type: GrantFiled: June 24, 1985Date of Patent: May 13, 1986Assignee: Xerox CorporationInventors: Milan Stolka, Kathleen M. McGrane, John S. Facci
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Patent number: 4346158Abstract: A photosensitive member having at least two electrically operative layers is disclosed. The first layer comprises an electrically conductive layer. The second layer comprises a charge transport layer. The third layer is a photoconductive layer contiguous with the transport layer. The photoconductive layer is capable of photogenerating and injecting photogenerated holes into the contiguous or adjacent electrically active part. The electrically active material comprises a polycarbonate resin material having dispersed therein from about 25 to 75 percent by weight of one or more compounds having the general formula: ##STR1## wherein X is selected from the group consisting of an alkyl group having from 1 to about 4 carbon atoms (e.g. methyl, ethyl, propyl, butyl, etc.) and chlorine in the ortho, meta or para position. This structure may be imaged in the conventional xerographic mode which usually includes charging, exposure to light and development.Type: GrantFiled: May 4, 1981Date of Patent: August 24, 1982Assignee: Xerox CorporationInventors: Damodar M. Pai, Milan Stolka, John F. Yanus
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Patent number: 4306008Abstract: A photosensitive member having at least two electrically operative layers is disclosed. The first layer comprises a photoconductive layer which is capable of photogenerating holes and injecting photogenerated holes into a contiguous charge transport layer. The charge transport layer comprises a polycarbonate resin containing from about 25 to about 75 percent by weight of one or more of a compound having a general formula: ##STR1## wherein R is selected from the group consisting of an alkyl group having from 1 to about 4 carbon atoms and chlorine in the ortho, meta or para position. This structure may be imaged in the conventional xerographic mode which usually includes charging, exposure to light and development.Type: GrantFiled: December 4, 1978Date of Patent: December 15, 1981Assignee: Xerox CorporationInventors: Damodar M. Pai, James M. Pearson, Milan Stolka, John F. Yanus
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Patent number: 4299897Abstract: A photosensitive member having at least two electrically operative layers is disclosed. The first layer comprises a photoconductive layer which is capable of photogenerating holes and injecting photogenerated holes into a contiguous charge transport layer. The charge transport layer comprises an electrically inactive organic resinous material containing from about 10 to about 75 percent by weight of: ##STR1## R.sub.1 is selected from the group consisting of hydrogen (ortho) CH.sub.3, (meta) CH.sub.3, (para) CH.sub.3, and R.sub.2 is selected from the group consisting of hydrogen, (ortho) CH.sub.3, (meta) CH.sub.3, and (para) CH.sub.3. The charge transport layer while substantially non-absorbing in the spectral region of intended use is "active" in that it allows injection of photogenerated holes from the photoconductive layer, and allows these holes to be transported through the charge transport layer.Type: GrantFiled: February 15, 1980Date of Patent: November 10, 1981Assignee: Xerox CorporationInventors: Milan Stolka, John F. Yanus, Damodar M. Pai, Dale S. Renfer, James M. Pearson
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Patent number: 4273846Abstract: An imaging member comprising a charge generation layer comprising a layer of photoconductive material and a contiguous charge transport layer of a polycarbonate resin material having dispersed therein from about 25 to about 75 percent by weight of one or more diamine compound having the general formula: ##STR1## wherein X.sub.1 and X.sub.2 are independently selected from the group consisting of a lower alkyl group having from 1 to about 4 carbon atoms, chlorine in the ortho, meta or para position, a para phenyl group and combinations thereof.Type: GrantFiled: November 23, 1979Date of Patent: June 16, 1981Assignee: Xerox CorporationInventors: Damodar M. Pai, S. Richard Turner, John F. Yanus, Dale S. Renfer, Milan Stolka
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Patent number: 4265990Abstract: A photosensitive member having at least two electrically operative layers is disclosed. The first layer comprises a photoconductive layer which is capable of photogenerating holes and injecting photogenerated holes into a contiguous charge transport layer. The charge transport layer comprises a polycarbonate resin containing from about 25 to about 75 percent by weight of one or more of a compound having the general formula: ##STR1## wherein X is selected from the group consisting of an alkyl group having from 1 to about 4 carbon atoms (e.g. methyl, ethyl, propyl, butyl, etc.) and chlorine in the ortho, meta or para position. This structure may be imaged in the conventional xerographic mode which usually includes charging, exposure to light and development.Type: GrantFiled: December 4, 1978Date of Patent: May 5, 1981Assignee: Xerox CorporationInventors: Milan Stolka, Damodar M. Pai, John F. Yanus
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Patent number: 4140529Abstract: A photosensitive member having at least two electrically operative layers is disclosed. The first layer comprises a photoconductive layer which is capable of photogenerating holes and injecting photogenerated holes into a contiguous charge transport layer. The charge transport layer comprises an electrically inactive organic resinous material containing from about 10 to about 75 percent by weight of: ##STR1## where R.sub.1 is selected from the group consisting of an alkyl with from 1 to 12 carbon atoms and an alkyl with from 1 to 12 carbon atoms substituted by aryl groups selected from the group consisting of phenyl, maphthyl, anthryl, and biphenyl and R.sub.2 is selected from the group consisting of methyl, ethyl, chloro, bromo and hydrogen.Type: GrantFiled: September 22, 1977Date of Patent: February 20, 1979Assignee: Xerox CorporationInventors: Damodar M. Pai, John F. Yanus, Milan Stolka
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Patent number: 4117239Abstract: Process for preparation of 2-anthryl and substituted 2-anthryl functional monomers and polymers. In the process for preparation of these monomers, an anthracenic reactant of the formula: ##STR1## wherein X and Y are independently selected from hydrogen, chlorine, bromine, alkyl of 1 to 4 carbon atoms or phenylIs acylated in nitrobenzene under conditions which favor reaction at the two position. The resulting acylated product can then be (a) reacted with an alkylidenephosphorane (Wittig synthesis) or (b) reduced to the corresponding alcohol. Subsequent to such reduction, this alcohol can undergo further modification at the hydroxyl function to form a polymerizable addition monomer.Type: GrantFiled: March 7, 1975Date of Patent: September 26, 1978Assignee: Xerox CorporationInventors: Milan Stolka, James M. Pearson, John F. Yanus
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Patent number: 4115116Abstract: A photosensitive member having at least two electrically operative layers is disclosed. The first layer comprises a photoconductive layer which is capable of photogenerating holes and injecting photogenerated holes into a contiguous charge transport layer. The charge transport layer comprises an electrically inactive organic resinous material containing from about 15 to about 75 percent by weight of N,N'-diphenyl-N,N'-bis(phenylmethyl)-[1,1'-biphenyl]-4,4'-diamine. The charge transport layer while substantially non-absorbing in the spectral region of intended use is "active" in that it allows injection of photogenerated holes from the photoconductive layer, and allows these holes to be transported through the charge transport layer. This structure may be imaged in the conventional xerographic mode which usually includes charging, exposure to light and development.Type: GrantFiled: May 4, 1977Date of Patent: September 19, 1978Assignee: Xerox CorporationInventors: Milan Stolka, Damodar M. Pai, John F. Yanus
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Patent number: 4075012Abstract: Method for achieving free radical initiated copolymerization of an addition monomer having pendant therefrom a strong donor group with an addition monomer having pendant therefrom a strong acceptor group. Copolymers prepared according to this method can be represented by the following formula: ##STR1## WHEREIN R is hydrogen or methyl;R' is hydrogen or methyl;R" is hydrogen or methyl;R'" is alkyl of 1-10 carbon atoms;R'.sup.v is selected from the group consisting of --NO.sub.2, halogen, --CN and --CF.sub.3 ;X and Y are independently selected from the group consisting of hydrogen, chlorine, bromine, alkyl of 1-4 carbon atoms and phenyl;Z is oxygen or dicyanomethylene;a and b can range from 0-4; andn and m can range from about 5 to about 95 percent.The polymeric compositions prepared according to this method are suitable for use in electrophotography either alone as the primary photoresponsive entity or in combination with other photoconductive materials.Type: GrantFiled: August 20, 1976Date of Patent: February 21, 1978Assignee: Xerox CorporationInventors: Sam R. Turner, Milan Stolka
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Patent number: 4052205Abstract: Novel photoconductive imaging members are provided comprising a layer of inorganic photoconductive material contained on a supporting substrate with a contacting layer of an electrically active organic material contiguous with the photoconductive layer comprising a plasticizer of an alkyl substituted anthracene.Type: GrantFiled: September 24, 1975Date of Patent: October 4, 1977Assignee: Xerox CorporationInventors: Milan Stolka, John F. Yanus
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Patent number: 4043812Abstract: Process for preparation of 2-anthryl and substituted 2-anthryl functional monomers and polymers. In the process for preparation of these monomers, an anthracenic reactant of the formula: ##STR1## wherein X and Y are independently selected from hydrogen, chlorine, bromine, alkyl of 1 to 4 carbon atoms or phenylIs acylated in nitrobenzene under conditions which favor reaction at the two position. The resulting acylated product can then be (a) reacted with an alkylidenephosphorane (Wittig synthesis) or (b) reduced to the corresponding alcohol. Subsequent to such reduction, this alcohol can undergo further modification at the hydroxyl function to form a polymerizable addition monomer.Type: GrantFiled: March 7, 1975Date of Patent: August 23, 1977Assignee: Xerox CorporationInventors: Milan Stolka, James M. Pearson, John F. Yanus
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Patent number: 4025710Abstract: Method for achieving free radical initiated copolymerization of an addition monomer having pendant therefrom a strong donor group with an addition monomer having pendant therefrom a strong acceptor group. Copolymers prepared according to this method can be represented by the following formula: ##STR1## wherein R is hydrogen or methyl;R' is hydrogen or methyl;R" is hydrogen or methyl;R'" is selected from the group consisting of --NO.sub.2, halogen, --CN and --CF.sub.3 ;X and Y are independently selected from the group consisting of hydrogen, chlorine, bromine, alkyl of 1-4 carbon atoms and phenyl;a and b can range from 0-4; andn and m can range from about 5 to about 95 percent.The polymeric compositions prepared according to this method are suitable for use in electrophotography either alone as the primary photoresponsive entity or in combination with other photoconductive materials.Type: GrantFiled: September 13, 1976Date of Patent: May 24, 1977Assignee: Xerox CorporationInventors: Milan Stolka, Sam R. Turner
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Patent number: 4013623Abstract: Method for achieving free radical initiated copolymerization of an addition monomer having pendant therefrom a strong donor group with an addition monomer having pendant therefrom a strong acceptor group. Copolymers prepared according to this method can be represented by the following formula: ##STR1## wherein R is hydrogen or methyl;R' is hydrogen or methyl;R" is hydrogen or methyl;R'" is alkyl of 1-10 carbon atoms;R'.sup.v is selected from the group consisting of --NO.sub.2, halogen, --CN and --CF.sub.3 ;X and Y are independently selected from the group consisting of hydrogen, chlorine, bromine, alkyl or 1-4 carbon atoms and phenyl;Z is oxygen or dicyanomethylene;a and b can range from 0-4; andn and m can range from about 5 to about 95 percent.The polymeric compositions prepared according to this method are suitable for use in electrophotography either alone as the primary photoresponsive entity or in combination with other photoconductive materials.Type: GrantFiled: July 16, 1975Date of Patent: March 22, 1977Assignee: Xerox CorporationInventors: Sam R. Turner, Milan Stolka
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Patent number: 4007043Abstract: Method for achieving free radical initiated copolymerization of an addition monomer having pendant therefrom a strong donor group with an addition monomer having pendant therefrom a strong acceptor group. Copolymers prepared according to this method can be represented by the following formula: ##STR1## wherein R is hydrogen or methyl;R' is hydrogen or methyl;R" is hydrogen or methyl;R'" is selected from the group consisting of --NO.sub.2, halogen, --CN and --CF.sub.3 ;X and Y are independently selected from the group consisting of hydrogen, chlorine, bromine, alkyl of 1 - 4 carbon atoms and phenyl;a and b can range from 0 - 4; andn and m can range from about 5 to about 95 percent.The polymeric compositions prepared according to this method are suitable for use in electrophotography either alone as the primary photoresponsive entity or in combination with other photoconductive materials.Type: GrantFiled: July 16, 1975Date of Patent: February 8, 1977Assignee: Xerox CorporationInventors: Milan Stolka, Sam R. Turner
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Patent number: 3994994Abstract: Process for preparation of block copolymers having photoconductive segments derived from a vinyl monomer and segments derived from a second addition monomer; said addition polymer segment also possibly being photoconductive. A polymer is initially prepared from one of the above monomers whereby the terminal groups of the resultant polymer are capable of generation of free radicals. By the appropriate selection of reaction medium it is possible to use the above free radical generating polymer to initiate polymerization of the second monomer, the polymer of which thereafter precipitates. This polymerization continues in the solid phase thereby preventing free radical decay even after depletion of the second monomer. The free radicals of these "living" polymers are quenched by the addition to the reaction medium of a monomer preferably corresponding to the structural units of the free radical generating polymer.Type: GrantFiled: February 19, 1975Date of Patent: November 30, 1976Assignee: Xerox CorporationInventor: Milan Stolka