Method for making glass nonfogging
US4169280A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 13, 1978 |
| Grant date | Sep 25, 1979 |
| Priority date | — |
| Expiry date | Jul 13, 1998 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06B7/12
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for rendering glass nonfogging (to condensation fog) by sandwiching the glass between two electrodes such that the glass functions as the dielectric of a capacitor, a large alternating current (AC) voltage is applied across the electrodes for a selected time period causing the glass to absorb a charge, and the electrodes are removed. The glass absorbs a charge from the electrodes rendering it nonfogging. The glass surface is undamaged by application of the AC voltage, and normal optical properties are unaffected. This method can be applied to optical surfaces such as lenses, auto windshields, mirrors, etc., wherever condensation fog on glass is a problem.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.