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VOLK DONALD A

Overview
  • Total Patents
    39
About

VOLK DONALD A has a total of 39 patent applications. Its first patent ever was published in 1988. It filed its patents most often in United States, WIPO (World Intellectual Property Organization) and EPO (European Patent Office). Its main competitors in its focus markets medical technology, optics and machines are PFLEGER ERNST, JINS INC and CROSS ANDREW JAY.

Patent filings per year

Chart showing VOLK DONALD As patent filings per year from 1900 to 2020

Focus industries

Top inventors

# Name Total Patents
#1 Volk Donald A 39

Latest patents

Publication Filing date Title
US2010238400A1 Multi-layered gradient index progressive lens
US2010091244A1 Real image forming eye examination lens utilizing two reflecting surfaces with non-mirrored central viewing area
US2009185135A1 Real image forming eye examination lens utilizing two reflecting surfaces providing upright image
WO2009025872A1 Real image forming eye examination lens utilizing two reflecting surfaces
CN101681028A Multi-layered gradient index progressive lens
MX2009004327A Multi-layered multifocal lens with blended refractive index.
US2008123049A1 Multi-layered multifocal lens with blended refractive index
US2008123048A1 Multi-layered gradient index progressive lens
WO9713453A1 High magnification indirect ophthalmoscopy lens device
CA2176385A1 Indirect ophthalmoscopy lens system and adapter lenses
WO9509560A1 Indirect ophthalmoscopy lens for use with slit lamp biomicroscope
US5333017A Indirect ophthalmoscopy lens for use with slit lamp biomicroscope
US5347326A Diagnostic or therapeutic contact lens
US5255025A Measurement apparatus for indirect ophthalmoscopy
US5200773A Diagnostic indirect ophthalmoscopy contact lens system
US5216456A Optical device for use with a slit lamp biomicroscope
US5173723A Aspheric ophthalmic accommodating lens design for intraocular lens and contact lens
US5046836A Diagnostic indirect ophthmalmoscopy contact lens system
US4913545A Adapter for lens retaining ring for use in connection with eye examination
US4934809A Lens positioning device for indirect biomicroscopy of the eye