Issued Patents All Time
Showing 1–22 of 22 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6089252 | Manifold for auxiliary fuel tank | — | 2000-07-18 |
| 5961778 | Corrugating apparatus | James E. Steffen, Raju Venkatapathy | 1999-10-05 |
| 5955193 | Apparel containing corrugated microfiber-containing thermal insulation | James E. Steffen, Raju Venkatapathy | 1999-09-21 |
| 5830311 | Corrugating apparatus | James E. Steffen | 1998-11-03 |
| 5804295 | Fibrous filtration face mask having corrugated polymeric microfiber filter layer | James E. Steffen | 1998-09-08 |
| 5763078 | Filter having corrugated nonwoven webs of polymeric microfiber | James E. Steffen | 1998-06-09 |
| 5753343 | Corrugated nonwoven webs of polymeric microfiber | James E. Steffen, Raju Venkatapathy | 1998-05-19 |
| 5656368 | Fibrous filtration face mask having corrugated polymeric microfiber filter layer | James E. Steffen | 1997-08-12 |
| 5639700 | Thermal insulation containing corrugated nonwoven web of polymeric microfiber | James E. Steffen, Raju Venkatapathy | 1997-06-17 |
| 5620545 | Method of making a corrugated nonwoven web of polymeric microfiber | James E. Steffen, Raju Venkatapathy | 1997-04-15 |
| D371587 | Goal for football practice | — | 1996-07-09 |
| 5078132 | Bonded adsorbent structures and respirators incorporating same | Peter O. Rekow | 1992-01-07 |
| 5052084 | Elastic strap fastener assembly | — | 1991-10-01 |
| 5035240 | Elastomeric filtration materials | Peter O. Rekow, Daniel E. Meyer | 1991-07-30 |
| 5033465 | Bonded adsorbent structures and respirators incorporating same | Peter O. Rekow | 1991-07-23 |
| 4934362 | Unidirectional fluid valve | — | 1990-06-19 |
| 4790306 | Respiratory mask having a rigid or semi-rigid, insert-molded filtration element and method of making | Donald L. Melvin | 1988-12-13 |
| 4668535 | Process for preparing a fuel tank of polyurethane laminate having contiguous contrasting layers | Paul E. Liggett | 1987-05-26 |
| 4583911 | Multiple fluid pathway energy converter | — | 1986-04-22 |
| 4565729 | Polyurethane laminate of contrasting layers and process therefor | Paul E. Liggett | 1986-01-21 |
| 4462399 | Powered air respirator and cartridge | — | 1984-07-31 |
| 4262408 | Assembling hose units for appliances | Ernest D. Johnson | 1981-04-21 |