The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 20, 2004
Filed:
Nov. 15, 2001
Applicant:
Inventor:
Eiji Noda, Kawasaki, JP;
Assignee:
Ricoh Company, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 3/70 ;
U.S. Cl.
CPC ...
G11B 3/70 ;
Abstract
An optical disc including a substrate having a top surface provided with a ROM area and a RAM area, and a recording layer provided on the substrate. The ROM area is provided with pre-grooves each having a bottom surface and wherein the RAM area is provided with pre-grooves. The ROM area also has pre-pits formed on the bottom surface of the pre-grooves thereof.