| Patents for Harry J. Keen |
Patents 1 -
5
of 5
      |
| Number | Date | Patentee | Title | Type |
| 3,917,981 | Nov. 04, 1975 | H.J. Keen | Scale Lighting Protection System | scales and balances |
| 3,990,032 | Nov. 02, 1976 | P. Barrett, H.J. Keen, C.H. Knodel, D.H. Fish | Vehicle Weighing System | scales and balances |
| 4,081,801 | Mar. 28, 1978 | H.J. Keen, H.C. Thomas | Electronic Measuring System with Pulsed Transducer | electrical measuring apparatus |
| 4,238,784 | Dec. 09, 1980 | H.C. Thomas, H.J. Keen | Electronic Measuring System with Pulsed Power Supply and Stability Sensing | electrical measuring apparatus |
| 4,549,439 | Oct. 29, 1985 | L.P. Barrett, H.J. Keen | Moistureproof Load Cell for Food Processing Applications and Method for Making the Same | electrical measuring apparatus |
