| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 8 | |
| #2 | United Kingdom | 5 | |
| #3 | Canada | 1 |
| # | Industry | |
|---|---|---|
| #1 | Chemical engineering | |
| #2 | Machines | |
| #3 | Textiles and paper | |
| #4 | Thermal processes |
| # | Technology | |
|---|---|---|
| #1 | Separation | |
| #2 | Unspecified technologies | |
| #3 | Unspecified technologies | |
| #4 | Making paper goods | |
| #5 | Air-conditioning |
| # | Name | Total Patents |
|---|---|---|
| #1 | Engle Paul M | 7 |
| #2 | Bauder Carl J | 3 |
| #3 | Swanton Jr John R | 2 |
| #4 | Baldwin William W | 2 |
| #5 | Cleminshaw Douglas R | 1 |
| #6 | Swanton John R Jr | 1 |
| #7 | Hart Charles G | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB1016050A | Filters | |
| US3138443A | Filter | |
| US3138077A | Filter pleating apparatus | |
| GB857231A | Filters for gases and vapours | |
| US2973828A | Filter | |
| US3019855A | Filters | |
| US2884091A | Filters | |
| US2907408A | Filter construction | |
| US2907407A | Filter construction | |
| CA597272A | Replaceable pleated filter |