Title:
【発明の名称】経時間表示材
Document Type and Number:
Japanese Patent JP3191328
Kind Code:
B2
Inventors:
Tatsuei Ito
Application Number:
JP18842391A
Publication Date:
July 23, 2001
Filing Date:
April 25, 1991
Export Citation:
Assignee:
Earth Chemical Co., Ltd.
International Classes:
G01N31/22; C09K3/00; G04F1/00; G04F13/00; (IPC1-7): G04F1/00; C09K3/00
Domestic Patent References:
| JP2290593A | ||||
| JP62179640A | ||||
| JP63212364A |
Attorney, Agent or Firm:
Toshikazu Fukai