Engel; Donald F.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Engel; Donald F..The latest application filed is for "air filter having fluted filter media".
- Engel; Donald F. - Prior Lake MN
| Patent | Date |
|---|---|
| Air filter having fluted filter media Grant 11,185,810 - Nepsund , et al. November 30, 2 | 2021-11-30 |
| Air Filter Having Fluted Filter Media App 20200254376 - Kind Code | 2020-08-13 |
| Air filter having fluted filter media Grant 10,556,202 - Nepsund , et al. Feb | 2020-02-11 |
| Air Filter Having Fluted Filter Media App 20180126317 - Nepsund; Larry R. ; et al. | 2018-05-10 |
| Air filter having fluted filter media Grant 9,782,713 - Nepsund , et al. October 10, 2 | 2017-10-10 |
| Air Filter Having Fluted Filter Media App 20160136562 - Nepsund; Larry R. ; et al. | 2016-05-19 |
| Air filter having fluted filter media Grant 9,162,172 - Nepsund , et al. October 20, 2 | 2015-10-20 |
| Air Filter Having Fluted Filter Media App 20140102057 - Nepsund; Larry R. ; et al. | 2014-04-17 |
| Air filter having fluted filter media Grant 8,562,707 - Nepsund , et al. October 22, 2 | 2013-10-22 |
| Filter arrangements; housings; assemblies; and, methods Grant 8,343,245 - Coulonvaux , et al. January 1, 2 | 2013-01-01 |
| Air Filter Having Fluted Filter Media App 20120272627 - Nepsund; Larry R. ; et al. | 2012-11-01 |
| Air filter having fluted filter media Grant 8,206,479 - Nepsund , et al. June 26, 2 | 2012-06-26 |
| Filter Arrangements; Housings; Assemblies; And, Methods App 20120031058 - Coulonvaux; Paul R. ; et al. | 2012-02-09 |
| Air Filter Having Fluted Filter Media App 20110296665 - Nepsund; Larry R. ; et al. | 2011-12-08 |
| Filter arrangements; side-entry housings; and methods Grant 7,981,183 - Nepsund , et al. July 19, 2 | 2011-07-19 |
| Filter arrangements; housing; assemblies; and, methods Grant 7,905,936 - Coulonvaux , et al. March 15, 2 | 2011-03-15 |
| Filter Arrangements; Side-entry Housings; And Methods App 20100132321 - Nepsund; Larry R. ; et al. | 2010-06-03 |
| Filter arrangements; side-entry housings; and methods Grant 7,655,074 - Nepsund , et al. February 2, 2 | 2010-02-02 |
| Air filter having fluted filter media Grant 7,635,403 - Nepsund , et al. December 22, 2 | 2009-12-22 |
| Air Filter Having Fluted Filter Media App 20080271423 - Nepsund; Larry R. ; et al. | 2008-11-06 |
| Air filter having fluted filter media Grant 7,396,375 - Nepsund , et al. July 8, 2 | 2008-07-08 |
| Filter Arrangements; Housing; Assemblies; and, Methods App 20070289265 - Coulonvaux; Paul R. ; et al. | 2007-12-20 |
| Filter arrangements; side-entry housings; and methods App 20070175194 - Nepsund; Larry R. ; et al. | 2007-08-02 |
| Air filter having fluted filter media App 20050229561 - Nepsund, Larry R. ; et al. | 2005-10-20 |
| Reverse flow air filter arrangement and method Grant 5,613,992 - Engel March 25, 1 | 1997-03-25 |
| Connector system for air transfer ducts Grant 5,129,685 - Engel July 14, 1 | 1992-07-14 |
| Quarter turn fastener Grant 5,123,795 - Engel , et al. June 23, 1 | 1992-06-23 |
| Air transfer system Grant 4,856,826 - Engel , et al. August 15, 1 | 1989-08-15 |
| Cylindrical air filter with lightweight housing and radially directed seal Grant 4,720,292 - Engel , et al. January 19, 1 | 1988-01-19 |
| Air-intake, moisture-eliminator duct apparatus Grant 4,699,639 - Gieseke , et al. October 13, 1 | 1987-10-13 |
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