Ultraviolet light monitoring device and method of making same
US4788433A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 12, 1987 |
| Grant date | Nov 29, 1988 |
| Priority date | — |
| Expiry date | Jan 12, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J1/48
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An ultraviolet light sensitive emulsion material, which becomes transparent to the user only after the ultraviolet light sensitive emulsion material is exposed to a predetermined amount of ultraviolet light, to expose a colored backing surface to view. In one form of the invention, an ultraviolet light inhibiting material is disposed in covering or blocking relationship relative to the emulsion material arranged in a graduated pattern of varying opacity, for inhibiting passage of ultraviolet light selectively to the ultraviolet light sensitive emulsion material to enable the emulsion to be rendered transparent in a series of graduated indications when the device is exposed to progressively longer periods of time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.