Air filters
US4498915A · kind A · utility
63Cited by
1References
3Claims
0Family size
Inventor
Key dates
| Filing date | Mar 12, 1980 |
| Grant date | Feb 12, 1985 |
| Priority date | — |
| Expiry date | Mar 12, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2275/201
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A generally tubular pleated paper filter element is constructed in the form of a frustrum of a cone having an aspect ratio (the ratio of element length to base diameter) in the range 1.5 to 2.5 and an included angle in the range 2 to 5 degrees.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.