Eyewear material, eyewear frame, and eyewear
US9720137B2 · kind B2 · utility
1Cited by
3References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 25, 2014 |
| Grant date | Aug 1, 2017 |
| Priority date | — |
| Expiry date | Sep 25, 2034 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/60
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The eyewear material is an eyewear material containing thermoplastic polyurethane. The eyewear material has a tan δ peak at both less than 0° C. and 0° C. or more and 70° C. or less observed in dynamic viscoelasticity measurement in tensile mode under the measurement conditions of a temperature increase speed of 5° C./min and a measurement frequency of 10 Hz.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.