Anodized substrates with dark laser markings
US10787753B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 14, 2016 |
| Grant date | Sep 29, 2020 |
| Priority date | — |
| Expiry date | Jun 8, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D11/246
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Anodized substrates having laser markings and methods for forming the same are described. According to some embodiments, the methods involve forming a feature on a substrate using a laser prior to anodizing. The laser energy and pulse width can be chosen so as to provide a particular topology to a surface of the substrate that, after anodizing, absorbs incoming light and imparts a dark appearance to the feature. In some cases, the methods involve forming a coarse oxide layer, which is removed prior to anodizing. Since the laser marking is performed prior to anodizing, the anodized substrates are free from laser-induced cracks, thereby making the anodized substrates more corrosion resistant than conventional laser-marked anodized substrates. The techniques are well suited for forming features on consumer products that may be exposed to water or other corrosion-inducing agents.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.