William Gray, 1852-1927 [RG3402.AM]


RG3402.AM:  William Gray, 1852-1927

Patents:  1898-1911

Lincoln, Lancaster County, Neb.:  Inventor, businessman

Size:  1 box; 0.5 cu.ft.


William Gray came to Lincoln from Beardstown, Illinois, in 1885, and established an architecture practice. By 1887 he left the firm of Gray and Placey to work independently from an office at 109 South 10th Street. He continued his career until 1898. Gray specialized in public buildings and was responsible for the design and construction of Ellen Smith Hall on the University of Nebraska campus. In 1898 Gray invented the Wonder grain grader. In 1908 he designed an improved pressure cooker which was sold under the trade name “Perfection Cooker.” It was manufactured in Omaha. Gray was Vice-President of the Eureka Manufacturing Company in Lincoln from 1901-1903. He died on January 20, 1927, at his Lincoln residence. He had been retired for five years.


This collection is arranged in three series: (1) United States patents, 1898-1908; (2) Foreign patents and related papers, 1907-1911; and (3) Miscellany. The material in the collection relates to William Gray’s invention of an improved pressure cooker and grain, ore and mineral separators. The bulk of the collection consists of foreign patents and related correspondence found in Series 2. The foreign patents are arranged alphabetically by name of country. The miscellaneous material in Series 3 consists of a memo pad and printed advertising copy.


Series 1 – U.S. Patents, 1898-1908

Box 1


    1. Patents for grain, ore and mineral separators

Series 2 – Foreign patents and related papers, 1907-1911

    1. Australia

    1. Austria

    1. Belgium

    1. Brazil

    1. China

    1. France

    1. Germany

    1. Great Britain

    1. Hungary

    1. India

    1. Italy

    1. Japan

    1. Mexico, Philippines

    1. Portugal

    1. Spain

    1. Russia

Series 3 – Miscellany

    1. Memo pad, advertising copy



Gray, William, 1852-1927

Inventions — Nebraska

Inventors — Nebraska


Separators (Machines)


Encoded TMM   04-07-2010

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