Patents by Inventor Jorma Lehtonen

Jorma Lehtonen 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).

  • Sealing arrangement for the attachment of a side plate of a centrifugal pump and an attachment screw used therewith
    Patent number: 8272823
    Abstract: The present invention relates to a sealing arrangement for attaching a side plate often used with a pump volute of a centrifugal pump and an attachment screw used therewith. A characterizing feature of the sealing arrangement for attaching the side plate of a centrifugal pump, comprising at least a pump volute (10) and a side plate (130) with attachment screws (132) and flanges (164) of the screws (132) arranged in communication with the volute (10) or the cover of the casing, is that an annular seal (180) is arranged between the screw (132) and the volute or the cover of the casing.
    Type: Grant
    Filed: October 24, 2007
    Date of Patent: September 25, 2012
    Assignee: Sulzer Pumpen AG
    Inventors: Jussi Ahlroth, Jorma Lehtonen
  • Sealing arrangement for the attachment of a side plate of a centrifugal pump and an attachment screw used therewith
    Publication number: 20080056846
    Abstract: The present invention relates to a sealing arrangement for attaching a side plate often used with a pump volute of a centrifugal pump and an attachment screw used therewith. A characterizing feature of the sealing arrangement for attaching the side plate of a centrifugal pump, comprising at least a pump volute (10) and a side plate (130) with attachment screws (132) and flanges (164) of the screws (132) arranged in communication with the volute (10) or the cover of the casing, is that an annular seal (180) is arranged between the screw (132) and the volute or the cover of the casing.
    Type: Application
    Filed: October 24, 2007
    Publication date: March 6, 2008
    Applicant: Sulzer Pumpen AG
    Inventors: Jussi Ahlroth, Jorma Lehtonen
  • Sealing arrangement for the attachment of a side plate of a centrifugal pump and an attachment screw used therewith
    Patent number: 7306427
    Abstract: The present invention relates to a sealing arrangement for attaching a side plate often used with a pump volute of a centrifugal pump and an attachment screw used therewith. A characterizing feature of the sealing arrangement for attaching the side plate of a centrifugal pump, comprising at least a pump volute (10) and a side plate (130) with attachment screws (132) and flanges (164) of the screws (132) arranged in communication with the volute (10) or the cover of the casing, is that an annular seal (180) is arranged between the screw (132) and the volute or the cover of the casing.
    Type: Grant
    Filed: April 28, 2006
    Date of Patent: December 11, 2007
    Assignee: Sulzer Pumpen AG
    Inventors: Jussi Ahlroth, Jorma Lehtonen
  • Sealing arrangement for the attachment of a side plate of a centrifugal pump and an attachment screw used therewith
    Publication number: 20060263212
    Abstract: The present invention relates to a sealing arrangement for attaching a side plate often used with a pump volute of a centrifugal pump and an attachment screw used therewith. A characterizing feature of the sealing arrangement for attaching the side plate of a centrifugal pump, comprising at least a pump volute (10) and a side plate (130) with attachment screws (132) and flanges (164) of the screws (132) arranged in communication with the volute (10) or the cover of the casing, is that an annular seal (180) is arranged between the screw (132) and the volute or the cover of the casing.
    Type: Application
    Filed: April 28, 2006
    Publication date: November 23, 2006
    Applicant: Sulzer Pumpen AG
    Inventors: Jussi Ahlroth, Jorma Lehtonen
  • Method for obtaining pure enantiomers of a pyridazinone derivative
    Patent number: 6180789
    Abstract: The present invention relates to a method for preparing optically active enantiomers of [[4-(1,4,5,6-tetrahydro-4-methyl-6-oxo-3-pyridazinyl)phenyl]-hydrazono]propanedinitrile (I), particularly (−) enantiomer of (I). Furthermore, the invention relates to a novel crystalline polymorphic form of the (−) enantiomer.
    Type: Grant
    Filed: February 4, 1999
    Date of Patent: January 30, 2001
    Assignee: Orion Corporation
    Inventors: Mika Timmerbacka, Jorma Lehtonen, Veli Pekka Tanninen, Esa Muttonen, Jukka Kaukonen, Riikka Hyppöl{umlaut over (a)}, Reijo B{umlaut over (a)}ckström