|
| US4023931 | 17 Feb 1976 | 17 May 1977 | Kenco Alloy & Chemical Co. Inc. | Means and method for measuring levels of ionic contamination |
| US4125440 | 25 Jul 1977 | 14 Nov 1978 | International Business Machines Corporation | Method for non-destructive testing of semiconductor articles |
| US4376027 | 27 May 1981 | 8 Mar 1983 | | Portable electrolytic testing device for metals |
| US4427496 | 25 Jan 1980 | 24 Jan 1984 | RCA Corporation | Method for improving the inspection of printed circuit boards |
| US4496432 | 27 Jun 1983 | 29 Jan 1985 | AT&T Technologies, Inc. | Electrolytic methods for enhancing contrast between metallic surfaces |
| US4828673 | 1 Mar 1988 | 9 May 1989 | Yokogawa Electric Corporation | Apparatus for measuring combustible gas concentration in flue gas |
| US7842916 | 22 Aug 2008 | 30 Nov 2010 | Samsung Electronics Co., Ltd. | Method of and apparatus for analyzing ions adsorbed on surface of mask |