Invention Grant
- Patent Title: Writing aid for the blind
- Patent Title (中): 为盲人写作辅助
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Application No.: US18249862Application Date: 1962-03-26
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Publication No.: US3193947APublication Date: 1965-07-13
- Inventor: DEAN MADISON H
- Applicant: DEAN MADISON H
- Assignee: Madison H Dean
- Current Assignee: Madison H Dean
- Priority: US18249862 1962-03-26
- Main IPC: G09B21/00
- IPC: G09B21/00
Public/Granted literature
- US20240014112A1 ELECTRONIC COMPONENT EMBEDDED SUBSTRATE Public/Granted day:2024-01-11
Information query
