Gas detectors for detecting the presence of various gases, namely, portable and stationary continuous monitoring gas detectors for use in a variety of industries including semiconductor, specialty chemical, automotive, oil and gas; portable gas detectors for use by first responders; accessories for use with stationary and portable gas detectors, namely, cassettes, controllers, badges, filters and sensors

computer software for use in estimating chemical reactivity and physical property parameters of compounds, and for word processing and data base management of chemical information