Moorhead Laboratories

* These pages will be a work in progress for a while, there is a lot of content to create. each article is hand cleaned, straightened, sharpened and cropped. Then a bibliography must be maintained, as many represent incredibly valuable ephemera now digitized. Sometimes this involves multiple layers of copyrights. Please consider all of this work under copyright.


Early Family History

Navy Connections

PPIE in his backyard

Married Life

A period of Struggle

Accidental Death

1915 - 1916

1917 - 1918 - 1919 

1920 - 1921 - 1922

1923 - 1924 - 1925 

Recreated production schedules of Moorhead Laboratories & it's spin-offs [1916-1925]

Address HIstory:
1719 Ninth Avenue, San Francisco, California, USAOtis Moorhead's home laboratory location

650 Mission Street, San Francisco, California, USA
Company formed, Aug 1915, occupying the 4th (top) floor
534-536 Pacific Street, San Francisco, California, USASales office split abt Jun 1916 due to factory noise
165 Jesse Street, San Francisco, California, USA
Factory moved to Jesse Street abt Feb 1917
638-640 Mission Street, San Francisco, California, USA Before Incorporation Jan 1918, Factory moved to 4 floor bldg.

Moorhead Laboratories, with its various names, rotating employees,and no evidence of securing any significant patents, represents a complicated story of persistence and ingenuity at all costs.. .  

Confirmed tube brandings: "VT", "Marconi-Deforest", "Moorhead Laboratories"

Other Advertised tube brandings: "A-P", "Atlantic-Pacific" were only used for 2-in-1 models

First Reference Found: San Francisco Examiner: 23 Jul 1916, pg 26; 

A classified ad shows "I.I. Davis" seeking Chrome & Manganese in any quantity, any form (534 Pacific Bldg)

Last Reference Found: Oakland Tribune: 26 Oct 1924, pg 38; 

The Oakland Tribune reports on pending decision in the Deforest lawsuits involving the Marconi-Deforest-Moorhead contracts.

Estimated production dates: Jan 1916 to 1924