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Patent applications and USPTO patent grants for Steffen; David E..The latest application filed is for "high rate seed sensor".
Patent | Date |
---|---|
High rate seed sensor Grant 4,555,624 - Steffen November 26, 1 | 1985-11-26 |
Corn and soybean sensor Grant 4,307,390 - Steffen , et al. December 22, 1 | 1981-12-22 |
Planter population monitor Grant 4,277,833 - Steffen July 7, 1 | 1981-07-07 |
Electronic disabling switch Grant 4,262,288 - Lanphier, III , et al. April 14, 1 | 1981-04-14 |
Planter population monitor Grant 4,225,930 - Steffen September 30, 1 | 1980-09-30 |
Seed sensor Grant 4,166,948 - Steffen September 4, 1 | 1979-09-04 |
Solid state seed sensor Grant 3,974,377 - Steffen August 10, 1 | 1976-08-10 |
Seed planter herbicide and insecticide monitor system Grant 3,921,159 - Steffen November 18, 1 | 1975-11-18 |
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