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P.L. RUBEN'S PATENTS

Revised 7-20-01

 

U.S. Patent:

Number  Granted  Description

6254233  07-03-01 Wide Angle View Eyeglasses

5915136  06-22-99 Real-Image Viewfinder with Stationary and Moveable Real Image Planes

5581409  12-03-96 Imaging System to Combine Disparate Fields of View

5537254  07-16-96 Compact Small Format Zoom Lens

5500770  03-19-96 Macrolens System for Emisssion Microscopy

5475460  12-12-95 Photographic Play Set Having Improved Lighting

5461512  10-24-95 Zoom Camera Lens Having Three Moving Groups

5335034  08-02-94 Zoom Viewfinder with Non-Rectangular Window

5335033  08-02-94 Lensless Camera Viewfinder
5331360 
07-19-94 Adapter for Overhead Projector

5300977  04-05-94 Zoom Viewfinder with Fixed Size Moving Window

5241337  08-31-93 Real Image Viewfinder Requiring No Field Lens

5182592  01-26-93 Real Image Zoom Viewfinder

5155517  10-13-92 Optical System with Improved Field Mask

5130845  07-14-92 Real Image Viewfinder

4949117  08-14-90 Camera 

4821053  04-11-89 Photographic Flash Device

3972592  08-03-76 Zoom Projection Lens

3944337  03-16-76 Aspheric Triplet

3905686  09-16-75 Three Element Projection Lens

3838910  10-01-74 Three Element Projection Lens

3697155  10-10-72 Compact Zoom Lens

3443863  05-13-69 Triplet-Type Objective Lens

3466118  09-09-69 Four Element Triplet Projection Lens

3517985  06-30-70 Six Element Petzval-Type Projection Lens

3466115  09-09-69 Four Component Wide Aperture Lens

3466114  09-09-69 Four Element Triplet Photographic Objective

3438696  04-15-69 Triplet-Type Objective Lens                                             

3449040  06-10-69 Projection Lens

3294470  12-27-66 Pancratic Condenser

3262362  07-26-66 Photographic Lens

3138651  06-23-64 Microscope Objective

3133983  05-19-64 Projection Lens

3185030  05-25-65 Projection Lens

3247764  04-26-66 Telephoto Lens

3244074  04-04-66 Microscope Objective

3174396  03-23-65 Microscope Objective

3118963  01-21-64 Microscope Objective

3115538  12-24-63 Microscope Objective

3102158  08-27-63 Microscope Objective

3041934  07-03-62 Microscope Objective

 
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