Lens dyeing method and apparatus comprising heating element contacting dyeing tank, heat controller and sensor for dye solution temperature
US5052337A · kind A · utility
25Cited by
13References
1Claims
0Family size
Inventors
Key dates
| Filing date | Oct 31, 1988 |
| Grant date | Oct 1, 1991 |
| Priority date | — |
| Expiry date | Oct 31, 2008 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06P5/003
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An apparatus and process for tinting plastic material; specifically, polycarbonate and other plastic eyeglass lenses. The dye solution has an elevated boiling point which allows for dyeing of the material at rates and temperatures above 212 degrees F. The dye solution temperature is maintained and controlled within a preselected tolerance by a temperature controlling unit and its associated heater, which is affixed to the dyeing tank. Dye solution is agitated and dispursed by a stirrer and stirring apparatus, and dye solution level is maintained by an automatic fill apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.