Information carrying discs
US4304806A · kind A · utility
25Cited by
12References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 1, 1980 |
| Grant date | Dec 8, 1981 |
| Priority date | — |
| Expiry date | Feb 1, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31663
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An information carrying element comprising a substrate having adhered to at least one surface thereof a separate layer having a thickness of 1.0 to 100 microns and a circular or spiral pattern of surface variations provides a particularly useful element when said separate layer comprises an abrasion resistant polymer layer derived from 30 to 100% by weight of an epoxy-terminated silane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.