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Mark Twain (Samuel L. Clemens) received Patent No. 121,992 for "An Improvement in Adjustable and Detachable Straps for Garments." He later received two more patents: one for a self-pasting scrapbook and one for a game to help players remember important historical dates.

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Class 352/142 - WITH SELECTION OF PLURAL LENSES


Subclass of Class 352 - Optics: motion pictures
Definition: Subject matter wherein one of a plurality of lenses may
No. of patents: 5
Last issue date: 08/09/2005


NumberTitleIssue Date
6927797Viewfinder for high definition video camera
A viewfinder for mounting on a camera having a video signal tap, such as a professional video camera, to extend forwardly and laterally of the camera. A pivotable member is connected to a support base for selectively pivoting about a laterally extending axis and bei...
08/09/2005
6754008Imaging lens arrangement designed for low light conditions
Disclosed is an improved lens system for low light applications. This improved low light lens system is designed for any suitable low light application, such as the above described biological imaging application. In one embodiment, a finite conjugate lens system is ...
06/22/2004
5027144Lens changer for cameras
Described herein is a lens changer for camera, which is provided with a unitary lens body integrally and contiguously formed with a main lens portion and at least one replacement lens portion of a different type in optical characteristics from the main le...
06/25/1991
4433907Lens alignment structure
An adjustable lens mounting device is provided in a photographic enlarger apparatus for adjusting the pitch and roll of the lens stage to achieve optimum alignment of a lens element therein. Pitch adjustment is provided by a pair of elements having comple...
02/28/1984
4420231Motion picture camera
Motion picture camera apparatus uses a 35 mm prime lens assembly for a 16 mm motion picture camera. Between the prime lens assembly and the motion picture camera there is positioned a pair of fixed parallel mirrors mounted at an angle to the axis of the p...
12/13/1983
 
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