The references cited below are useful in familiarizing the reader with earlier published articles on similar technology, some of which led to the development of the IP being offered.

US Patent 6,590,207	"Microscale mass spectrometric chemical-gas sensor" Issued July 8, 2003. Philip S. Berger; W. Ronald Gentry. Available for Licensing
US Patent 6,831,276	"Microscale mass spectrometric chemical-gas sensor" Issued December 14, 2004. P. S. Berger; W. R. Gentry; H. W. Rohrs. Available for Licensing
Prior Art:
US Patent 6,501,074	"Double-focusing mass spectrometer apparatus and methods regarding same" Issued December 31, 2002. W. Ronald Gentry; Clayton F. Giese; Jorge A. Diaz-Diaz.
US Patent 4,054,796	"Mass spectrometer with superimposed electric and magnetic fields" Issued October 18, 1977. M. Naito.
Other References:
The following articles show applications for predecessors to the current technology. "Sub-miniature double-focusing mass spectrometer for in situ environmental monitoring and application to volcanic gaseous emissions", Jorge A. Diaz, PhD Thesis, University of Minnesota, July 1999 "Miniature Mass Spectrometers for Hydrogen Isotopic Analyses", W. A. Spencer and L. L. Tovo, Westinghouse Savannah River Company, Aiken, SC 29808 NASA Reports under SBIR contracts The following report, written by principal investigator, Southwest Sciences, Inc. (Santa Fe, MN), was submitted to NASA in partial fulfillment of its contract under the Small Business Innovation Research (SBIR) program. Work was performed in collaboration with Mass Sensors, Inc. (St. Louis, MO). "A Novel Sensor for Spacecraft/Habitat Chemical Contamination", Phase II SBIR Contract NAS-9-99146, Final Report, D. Bomse, et. al., Southwest Sciences, Inc., Santa Fe, NM, November 26, 2002.