ROBERT A MITCHELL
Engineers in Wilmington, DE
License number
Pennsylvania PE005218L
Category
Engineers
Type
Professional Engineer
Address
Address
2
Wilmington, DE 19810
Pennsylvania
Pennsylvania
Professional information
Robert Mitchell - Newcastle, DE
Work:
Sprint - Newcastle, WA
Sales Rep Amazon.com - Newcastle,DE
Warehouse Worker H&R Block - Baltimore, MD
Client Service Proffesional
Sales Rep Amazon.com - Newcastle,DE
Warehouse Worker H&R Block - Baltimore, MD
Client Service Proffesional
Education:
Delaware Technical and community college - Stanton, DE
Automotive
Automotive
Skills:
Retail sales and customer service expert demonstrating a high level of ownership and initiative. Quick and effective at decision making. Consistently meets commission-based sales goals, while maintaining excellent customer service throughout the sales process.
Process For Preparation Of Liquid Toners For Electrostatic Imaging Using Polar Additive
US Patent:
4631244, Dec 23, 1986
Filed:
Feb 18, 1986
Appl. No.:
6/830851
Inventors:
Robert D. Mitchell - Wilmington DE
Assignee:
E. I. Du Pont de Nemours and Company - Wilmington DE
International Classification:
G03G 912
US Classification:
430137
Abstract:
Process for preparation of toner particles for electrostatic imaging comprising
A. dispersing at an elevated temperature in a vessel a thermoplastic resin, a dispersant nonpolar liquid having a Kauri-butanol value of less than 30 and optionally a colorant, the temperature being maintained to plasticize and liquify the resin and below that at which the nonpolar liquid degrades and any component decomposes;
B. cooling the dispersion, either
(1) with or without stirring to form a gel or solid mass, the shredding and grinding the mass by means of particulate media in the presence of additional liquid;
(2) with stirring to form a viscous mixture and grinding by means of particulate media in the presence of additional liquid; or
(3) while grinding the particulate media thereby preventing formation of a gel or solid mass in the presence of additional liquid, and
C. separating the dispersion of toner particles, average by area particle size less than 10. mu. m, from particulate media, the improvement whereby there is present, at least during the grinding in step B, 0.
Liquid Electrostatic Developers Containing Aromatic Hydrocarbons
US Patent:
4663264, May 5, 1987
Filed:
Apr 28, 1986
Appl. No.:
6/856393
Inventors:
Robert D. Mitchell - Wilmington DE
Assignee:
E. I. Du Pont de Nemours and Company - Wilmington DE
International Classification:
G03G 912
US Classification:
430115
Abstract:
Liquid electrostatic developer having improved charging characteristics consisting essentially of
(A) nonpolar liquid having a Kauri-butanol value of less than 30,
(B) thermoplastic resin particles substantially nonsoluble in nonpolar liquid and aromatic hydrocarbon at ambient temperature and having an average by area particle size of less than 10. mu. m,
(C) nonpolar liquid soluble ionic or zwitterionic compound, and
(D) aromatic hydrocarbon having a Kauri-butanol value of greater than 30.
The electrostatic liquid developers are useful in copying, making proofs including digital color proofs, lithographic printing plates, and resists.
Polyhydroxy Charging Adjuvants For Liquid Electrostatic Developers
US Patent:
4734352, Mar 29, 1988
Filed:
Apr 22, 1986
Appl. No.:
6/854610
Inventors:
Robert D. Mitchell - Wilmington DE
Assignee:
E. I. Du Pont de Nemours and Company - Wilmington DE
International Classification:
G03G 912
US Classification:
430115
Abstract:
Electrostatic liquid developer having improved charging characteristics consisting essentially of
(A) nonpolar liquid having a Kauri-butanol value of less than 30, present in a major amount,
(B) thermoplastic resin particles having an average by area particle size of less than 10. mu. m.
(C) nonpolar liquid soluble ionic or zwitterionic compound, and
(D) a polyhydroxy compound, preferably soluble in the developer in an amount of at least 2% by weight.
The electrostatic liquid developers are useful in copying making proofs including digital color proofs, lithographic printing plates, and resists.