Earl R. Helderman
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Earl R. Helderman (? – ?)
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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 |