Invention Grant
- Patent Title: Filter unit
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Application No.: US32330728Application Date: 1928-12-03
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Publication No.: US1792797APublication Date: 1931-02-17
- Inventor: ARMSTRONG JOHN J
- Applicant: ARMSTRONG JOHN J
- Assignee: John J Armstrong
- Current Assignee: John J Armstrong
- Priority: US32330728 1928-12-03
- Main IPC: B01D25/12
- IPC: B01D25/12 ; B01D29/00 ; B01D33/00 ; B01D37/02
Information query
