Earl R. Helderman

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Earl R. Helderman (? – ?)

   Please add referenced biography.

Documents Authored by Earl Helderman

Products by Earl R. Helderman

Components by Earl R. Helderman

Patents by Earl R. Helderman

Page Office Number Title Inventors Company Filing date Grant date
Patent US 4331476A US 4331476A Sputtering targets with low mobile ion contamination Earl R. Helderman • Robert R. Zimmerman Tektronix Inc 1980-01-31 1982-05-25
Patent US 4490408A US 4490408A Method and device for metallizing the internal surface of a hollow object Robert R. Zimmerman • Larry D. Kunkler • Earl R. Helderman Tektronix Inc 1983-03-14 1984-12-25
Patent US 4847445A US 4847445A Zirconium thin-film metal conductor systems Earl R. Helderman • Robert Holmes • Robert R. Zimmerman Tektronix Inc 1985-02-01 1989-07-11
Patent US 4788627A US 4788627A Heat sink device using composite metal alloy Michael R. Ehlert • Earl R. Helderman Tektronix Inc 1986-06-06 1988-11-29
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