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Manufacturers Index - Hilger & Watts
Patents
This page contains information on patents issued to this manufacturer.

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USPTO = U.S. Patent Office . Images of the actual patent can be viewed on the U.S. Patent Office web site but a special TIFF viewer must be installed with your browser in order properly work. More information on how to configure your computer to view these patents can be found at TIFF image Viewers for Patent Images.
DATAMP = Directory of American Tool And Machinery Patents . A sister site to VintageMachinery.org with information on patents related to machinery and tools. A much easier user interface than the USPTO's for finding information on machinery patents.

Patent Number Date Title Name City Description
2,480,237 Aug. 30, 1949 Optical Device for Accurate Reading of Annular Scales Charles John Godfrey , England
    Optical Device for Accurate Reading of Annular Scales Victor William Henry Towns , England  
2,483,897 Oct. 04, 1949 Optical Precision Gauge Charles John Godfrey , England Application in Great Britain, 01 Mar. 1945.
2,505,166 Apr. 25, 1950 Spirit Level Albert Wood , England
2,604,229 Jul. 22, 1952 Closure Seal for Vacuum Vessels Ernst Schwarz , England
2,636,855 Apr. 28, 1953 Method of Producing Photoconductive Coatings Ernst Schwarz , England
2,639,833 May. 26, 1953 Vacuum Seal Ernst Schwarz , England
2,717,401 Sep. 13, 1955 Device for Cutting Very Fine Screw Threads Alexander Charles George Menzies , England Claims priority, application in Great Britain, 18 Jul., 1950.
    Device for Cutting Very Fine Screw Threads George Edwin Fensom , England  
    Device for Cutting Very Fine Screw Threads Walter Zehden , England  
2,853,664 Sep. 23, 1958 Digital Servosystem for Postioning an Adjustable Member Victor William Henry Towns , England
    Digital Servosystem for Postioning an Adjustable Member David Silvester Evans , England  
    Digital Servosystem for Postioning an Adjustable Member Patrick Ludlow Fleming Jones , England  
2,981,141 Apr. 25, 1961 Optical Compensator and Tilt Detector John Argent Armstrong , England Claims priority, application Great Britain 16 Jan., 1957.

Claim:
Optical instruments used in surveying and engineering, often employ a telescope of which the line of sight is required to be level when observations are taken. Heretofore it has been customary for the telescope body to be set up truly horizontal in order to ensure that the optical axis of the instrument is also horizontal, and the operations necessary to do this are both tedious and time wasting. Furthermore, when, as is usually the case, a bubble is used to obtain the level inaccuracies occur due to the sensitivity of the bubble to changes of temperature, such as may occur from the effects of direct sunlight or cold draughts.
    Optical Compensator and Tilt Detector Douglas William Berry , England