EP0132137B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Disc for recording and reproducing optical information
Assignee: Panasonic Holdings Corp
•
Filing: 1984-07-13
•
Granted: 1990-12-27
•
Expires: 2004-07-13
Abstract
No abstract record available.
Inventors
- 👤 Takeo Ohta
- 👤 Tatsushi Nakamura
- 👤 Shizuhiko Tanigawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 20:18
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/2407; G11B7/24085; G11B27/00; G11B27/10; G11B27/19; G11B27/28; G11B27/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
A system according to claim 1, wherein the pitch of the grooves of the pits are not greater than 1.7 micrometre, the width of the grooves and pits range between 0.48 and 0.68 micrometre and the depth of the grooves or pits range between 63 nanometre and 78 nanometre.
Claim 2
Dependent Claim
35 words
A system according to claim 1 or claim 2, wherein the reflectivity of the film surface on the grooves to the laser beam applied from the side of the substrate ranges between 8% and 14%.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.