1
Richard J Wessling: Color TV projection lens system. U S Precision Lens Incorporated, A L Michaelsen, October 8, 1991: US05055922 (18 worldwide citation)

Disclosed is an improved color projection TV lens system which provides reduced chromatic aberration and improved chromaticity. These improvements are achieved by incorporating a light absorbing material into at least one lens in the system wherein the lens has a substantially uniform thickness.


2
Wessling Richard Joseph: Improved color tv projection lens system.. Us Precision Lens, September 11, 1991: EP0445513-A1 (1 worldwide citation)

Disclosed is an improved color projection TV lens system (10) which provides reduced chromatic aberration and improved chromaticity. These improvements are achieved by incorporating a light absorbing material into at least one lens (18) in the system wherein the lens has a substantially uniform thic ...


3
Wessling Richard Joseph: Objectif de projection dimages de television en couleurs, Improved color tv projection lens system. 3m Innovative Properties Company, GOWLING LAFLEUR HENDERSON, September 5, 2000: CA2034914

Disclosed is an improved color projection TV lenssystem which provides reduced chromatic aberration andimproved chromaticity. These improvements are achieved byincorporating a light absorbing material into at least onelens in the system wherein the lens has a substantiallyuniform thickness.