D-Mark, Inc.
4Patents
0Active
4Granted
29Portfolio score
Filing activity: Sep 8, 1978 → Jun 30, 1993
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5338340A | Filter and method of making same | Emerging Cross-Sectional Technologies | 62 | Expired |
| US4227904A | Gas phase permeable filter | Performing Operations; Transporting | 51 | Expired |
| US4699681A | Method of making a gas phase permeable filter | Emerging Cross-Sectional Technologies | 41 | Expired |
| US5124177A | Filter and method of making same | Performing Operations; Transporting | 39 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.