Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Optical head device and birefringent diffraction grating polarizer and polarizing hologram element used therein

Optical head device and birefringent diffraction grating polarizer and polarizing hologram element used therein

US Patent 5659531 · Granted Aug 19, 1997

Estimated economic value: $25,000 ⓘ

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Cleavage method of bisphenols2002
Preparation process of phenol aralkyl resins2000
Random-block copolymer and monofilament thereof2000
Optical head device and birefringent diffraction grating polarizer and polarizin1999
Optical head device and birefringent diffraction grating polarizer and polarizin1999
Method for preventing the inner wall surfaces of the polymerization apparatus fr1998
Mechanism for scanning the inner periphery of a drum included in an image formin1997
Optical head device and birefringent diffraction grating polarizer and polarizin1996
Optical head device and birefringent diffraction grating polarizer and polarizin1996
Optical head using birefringent diffraction grating1996
Fingerprint image input device having an image sensor with openings1995
Method and arrangement of generating a non-diffractive beam at a location which 1994