Apparatus for coating items
US4345546A · kind A · utility
Inventor
Key dates
| Filing date | Jun 15, 1981 |
| Grant date | Aug 24, 1982 |
| Priority date | — |
| Expiry date | Jun 15, 2001 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05C3/09
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The invention comprises a method and apparatus for providing a coating to objects such as a lens. A bath of coating solution is provided and the objects are immersed into the solution and removed from the solution at a constantly changing speed. The speed of removal is slower at the top and bottom of the object and faster at the midpoint of the object. Thus the coating is thinner at the top and bottom and thicker at the center (where greater abrasion resistence is required). The slower speed at the removal of the bottom edge of the lens from the solution provides a thin coating and eliminates the formation of coating drip lines and puddles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.