Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6514417 | Microwave assisted cleaning and reclamation of industrial wastes | David A. Purta | 2003-02-04 |
| 5886348 | Non-dispersive infrared gas analyzer with interfering gas correction | Harold S. Lessure, Satoru Simizu, Louis J. Denes | 1999-03-23 |
| 5785847 | Microwave assisted cleaning and reclamation of industrial wastes | David A. Purta | 1998-07-28 |
| 5481983 | Magnetic sweeper apparatus and method | Hodge E. Jenkins, Ronald R. Newman, Suryanarayan G. Sankar, John G. Tabacchi | 1996-01-09 |
| 5049861 | Method and system for detecting underground mine fires | Richard L. Grace, David A. Purta | 1991-09-17 |
| 4911892 | Apparatus for simultaneous detection of target gases | Richard L. Grace, Marc A. Portnoff, Paul D. Runco, Lymperios N. Yannopoulos | 1990-03-27 |
| 4847783 | Gas sensing instrument | Richard L. Grace, Marc A. Portnoff, David A. Purta, Paul D. Runco, John G. Tabacchi | 1989-07-11 |
| 4812826 | Thermal sensor for detection of railroad bearing failures | William M. Kaufman | 1989-03-14 |