Skip to Content
You searched for
Search
Creator De Forest, Lee, 1873-1961 Remove constraint Creator: De Forest, Lee, 1873-1961

Search Constraints

Search Results

    • 1953-Jan-07

    In this letter, Beckman declines to develop de Forest's light amplifier.

    • 1952-Nov-19

    This letter suggests Beckman might be interested in commercial development of de Forest's new invention, a "sandwich, non-vacuous, light amplifier."

    • 1952-Apr-29

    U.S. Patent 2,594,740, filed on behalf of Lee de Forest and William A. Rhodes, describes a device for amplifying the intensity of radiation.

    Lee de Forest (1873–1961) was an inventor, most notably of Audion vacuum…

    • 1936-Nov-10

    Lee de Forest states that he returned from a trip to Chicago to find his company in financial disarray. He regrets that Beckman's contracted work was continued, despite an inability to pay for it, and assures him that…

    • 1936-Oct-09

    Lee de Forest states that he has "temporarily become disassociated from the activities of De Forest Television Corporation" and advises Beckman to retain any equipment currently in his possession.

    Lee de Forest…

    • 1936-Jul-02

    Lee de Forest discusses testing Beckman's film-coating process with antimony. A sample of antimony paper is included.

    • 1934-May-10

    In this letter, de Forest discusses the possibility of using chemicals to fight forest fires.

    Lee de Forest (1873–1961) was an inventor, most notably of Audion vacuum tubes in the early twentieth century. His serial…

    • 1931-Nov-09

    In this letter, de Forest proposes a process that could replace halftone film.

    Lee de Forest (1873–1961) was an inventor, most notably of Audion vacuum tubes in the early twentieth century. His serial business ventures…

    • 1931-Oct-22

    De Forest inquires about Beckman's progress toward a chemical coating that might change in opacity or color, and details the "very fine and uniform quality" of silver coated film de Forest is able to produce.

    Lee de…

    • 1931-Oct-09

    The letter discusses the "very nice results" of using new Eastman film and queries as to the possible effects of light upon silvering solution.

    Lee de Forest (1873–1961) was an inventor, most notably of Audion vacuum…

    • 1931-Sep-09

    The letter requests deliverables of 100 feet of silvered film, and two 10 foot pieces with a silver coating on emulsion film and clear stock.

    Lee de Forest (1873–1961) was an inventor, most notably of Audion vacuum…

    • 1931-Jul-18

    Arnold O. Beckman, then an assistant professor of chemistry at Caltech, offers his assistance as a consulting chemist.

    Lee de Forest (1873–1961) was an inventor, most notably of Audion vacuum tubes in the early…

    • 1931-Jul-15

    In this letter, Lee de Forest requests a referral to a chemist who might help electroplate film.

    Lee de Forest (1873–1961) was an inventor, most notably of Audion vacuum tubes in the early twentieth century. His serial…