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Patent applications and USPTO patent grants for Krohn; Holger.The latest application filed is for "method and device for producing respiratory air which is harmless to health in positive pressure nasal breathing apparatus".
Patent | Date |
---|---|
Method and device for producing respiratory air which is harmless to health in positive pressure nasal breathing apparatus Grant 6,332,462 - Krohn December 25, 2 | 2001-12-25 |
Method of electrically measuring the concentration of acids Grant 4,988,418 - Beck , et al. January 29, 1 | 1991-01-29 |
Four-quadrant current-regulated energization of D.C. motor using pulse-width modulation Grant 4,146,827 - Krohn March 27, 1 | 1979-03-27 |
Duplicating method and arrangement Grant 4,064,446 - Krohn December 20, 1 | 1977-12-20 |
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