| Patent Number |
Title Of Patent |
Date Issued |
| 7400394 |
Co-deployed optical referencing for responsive dust-based sensing system |
July 15, 2008 |
| Apparatus and methods for calibrating an optical detector. In one embodiment an optical reference apparatus includes a body having an outer surface. At least a portion of the outer surface has a reflectance that can vary. The optical reference apparatus is adapted to be deployed with |
| 6077885 |
Chromate-free protective coatings |
June 20, 2000 |
| The invention provides chromate-free coating mixtures, and coatings formed from these mixtures, that protect an underlying aluminum or aluminum alloy substrate from corrosion. The coating mixtures include a continuous phase selected from organic polymeric compositions, or sol-gels, and a |
| 5866652 |
Chromate-free protective coatings |
February 2, 1999 |
| The invention provides chromate-free coating mixtures, and coatings formed from these mixtures, that protect an underlying aluminum or aluminum alloy substrate from corrosion. The coating mixtures include a continuous phase selected from organic polymeric compositions, or sol-gels, and a |
| 5126803 |
Broadband quantum well LED |
June 30, 1992 |
| An LED having a broadband emission spectrum. In one embodiment, the LED comprises a layered semiconductor structure of length L, the structure including an active layer comprising multiple asymmetric quantum wells. A pair of stripe electrodes is formed on a surface of the structure, to |
| 4895017 |
Apparatus and method for early detection and identification of dilute chemical vapors |
January 23, 1990 |
| A detector and method for identifying a chemical vapor and determining its concentration in the ambient atmosphere. The chemical detector apparatus (120) preferably includes a plurality of surface acoustic wave (SAW) devices (10), each including a piezoelectric substrate (20), one-half ( |
| 4783987 |
System for sustaining and monitoring the oscillation of piezoelectric elements exposed to energy |
November 15, 1988 |
| The disclosed system includes a piezoelectric crystal exposed to an energy-absorptive medium of interest. A crystal oscillation circuit is included for sustaining oscillation of the crystal in contact with the fluid. To accomplish this, the circuit includes feedback elements for prov |
| 4495793 |
Sensing device for detecting the presence of a gas contained in a mixture thereof |
January 29, 1985 |
| A sensing device which senses the presence and/or concentration of one or more gases contained in a mixture is disclosed. An electrically charged semiconductor whose surface is in contact with the mixture of gases is illuminated with light, either intermittently or constantly. Changes in |
