Patents by Inventor Marco Stifel

Marco Stifel has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Filter device
    Patent number: 9920668
    Abstract: A filter device may include a filter housing cover defining a chamber and an annular filter element arranged within the receiving chamber. The filter device may further include a housing and at least one intermediate piece arranged between the filter housing cover and the housing when the cover is secured to the housing. An inlet duct may be in communication with an untreated side of the filter element and an outlet duct may be in communication with a clean side of the filter element. A drainage duct may be arranged in the housing for draining the chamber during removal of the cover. A closure device may be arrange in the intermediate piece and have a closure element configured to close the drainage duct.
    Type: Grant
    Filed: November 12, 2015
    Date of Patent: March 20, 2018
    Assignee: Mahle International GmbH
    Inventors: Markus Hirsch, Marco Stifel, Zhang Yuan
  • FILTER DEVICE
    Publication number: 20160069232
    Abstract: A filter device may include a filter housing cover defining a chamber and an annular filter element arranged within the receiving chamber. The filter device may further include a housing and at least one intermediate piece arranged between the filter housing cover and the housing when the cover is secured to the housing. An inlet duct may be in communication with an untreated side of the filter element and an outlet duct may be in communication with a clean side of the filter element. A drainage duct may be arranged in the housing for draining the chamber during removal of the cover. A closure device may be arrange in the intermediate piece and have a closure element configured to close the drainage duct.
    Type: Application
    Filed: November 12, 2015
    Publication date: March 10, 2016
    Inventors: Markus Hirsch, Marco Stifel, Zhang Yuan
  • Filter device
    Patent number: 9212576
    Abstract: A filter may include a cover defining a chamber and an annular filter element arranged within the chamber. The filter may also include a housing and at least one intermediate piece arranged between the cover and the housing when the cover is screwed to the housing. An inlet duct may be in communication with an untreated side of the filter element and an outlet duct may be in communication with a clean side of the filter element. A drainage duct may be arranged in the housing for draining the chamber during removal of the cover. A closure device may be arrange in the intermediate piece and have a closure element configured to close the drainage duct.
    Type: Grant
    Filed: June 18, 2010
    Date of Patent: December 15, 2015
    Assignee: Mahle International GmbH
    Inventors: Markus Hirsch, Marco Stifel, Zhang Yuan
  • Filter device
    Patent number: 8920650
    Abstract: A filter may include ac over defining a chamber and an annular filter element arranged within the chamber. The filter may also include a housing and at least one intermediate piece arranged between the cover and the housing when the cover is screwed to the housing. An inlet duct may be in communication with an untreated side of the filter element and an outlet duct may be in communication with clean side of the filter side of the filter element and an outlet duct may be in communication with a clean side of the filter element. A drainage duct may be arranged in the housing for draining the chamber during removal of the cover. A closure device may be arranged in the intermediate piece and have a closure element configured to close the drainage duct.
    Type: Grant
    Filed: June 18, 2010
    Date of Patent: December 30, 2014
    Assignee: Mahle International GmbH
    Inventors: Marco Stifel, Zhang Yuan
  • FILTER DEVICE
    Publication number: 20120168365
    Abstract: A filter may include ac over defining a chamber and an annular filter element arranged within the chamber. The filter may also include a housing and at least one intermediate piece arranged between the cover and the housing when the cover is screwed to the housing. An inlet duct may be in communication with an untreated side of the filter element and an outlet duct may be in communication with clean side of the filter side of the filter element and an outlet duct may be in communication with a clean side of the filter element. A drainage duct may be arranged in the housing for draining the chamber during removal of the cover. A closure device may be arranged in the intermediate piece and have a closure element configured to close the drainage duct.
    Type: Application
    Filed: June 18, 2010
    Publication date: July 5, 2012
    Inventors: Marco Stifel, Zhang Yuan
  • FILTER DEVICE
    Publication number: 20120160756
    Abstract: A filter may include a cover defining a chamber and an annular filter element arranged within the chamber. The filter may also include a housing and at least one intermediate piece arranged between the cover and the housing when the cover is screwed to the housing. An inlet duct may be in communication with an untreated side of the filter element and an outlet duct may be in communication with a clean side of the filter element. A drainage duct may be arranged in the housing for draining the chamber during removal of the cover. A closure device may be arrange in the intermediate piece and have a closure element configured to close the drainage duct.
    Type: Application
    Filed: June 18, 2010
    Publication date: June 28, 2012
    Inventors: Markus Hirsch, Marco Stifel, Zhang Yuan