Searching US Patent Collection...

	PAT. NO.		Title
1	5,451,931		Optical smoke detector
2	4,945,501		Method for determining position within the measuring volume of a coordinate measuring machine and the like and system therefor
3	4,668,080		Method and apparatus for forming large area high resolution patterns
4	4,663,524		Apparatus for measuring parameters of light spots with a moving knife-edge mask
5	4,601,581		Method and apparatus of determining the true edge length of a body
6	4,585,513		Method for removing glass support from semiconductor device
7	4,576,439		Reflective diffractive authenticating device
8	4,534,620		Standardized multi-stack dielectric-layer filter blank and method for fabricating color-encoding filter therefrom
9	4,523,850		System for positioning a body
10	4,464,030		Dynamic accuracy X-Y positioning table for use in a high precision light-spot writing system
11	4,417,784		Multiple image encoding using surface relief structures as authenticating device for sheet-material authenticated item
12	4,353,622		Recording blank and method for fabricating therefrom diffractive subtractive filter metal embossing master
13	4,213,673		Projector for reading out color-encoded focused image holograms employing an optimum encoding scheme
14	4,157,220		Technique for recording micropicture-information on a diffractive subtractive filter embossing master
15	4,155,627		Color diffractive subtractive filter master recording comprising a plurality of superposed two-level relief patterns on the surface of a substrate