Patents by Inventor Lennart Dahlgren

Lennart Dahlgren 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).

  • Patent number: 5857891
    Abstract: A water activity toy has a channel for a stream of water which floats a vessel on the stream, and a paddle wheel that moves through the channel to generate the stream. The paddle wheel includes a plurality of blades on axle stubs which are removably mounted on mountings at opposite sides of the channel. A crank used to rotate the paddle wheel is connected with one axle stub which is liftable out of its mounting. Lifting the crank tilts the paddle wheel to provide clearance for a tall vessel floating by the paddle wheel mountings. The mountings have similar constructions and are oppositely facing. Each mounting includes a horizontal open ended bearing slot having a side slot with a constriction at the outboard end of the slot. Each axle stub includes parallel flattened surfaces which form a reduced dimension region that enables the axle stub to pass radially through the constriction, provided that radial protrusions on the flattened surfaces are out of alignment with the constriction.
    Type: Grant
    Filed: July 24, 1997
    Date of Patent: January 12, 1999
    Assignee: Aquaplay AB
    Inventor: Lennart Dahlgren
  • Patent number: 5681949
    Abstract: In an alkyl glucoside of formula (I) R.sup.1 is an alkyl group having 2-5 carbon atoms, preferably 2-4 carbon atom; R.sup.2 is an alkyl group having 4-7 carbon atoms, preferably 5 or 6 carbon atoms, the sum of the carbon atoms in R.sup.1 and R.sup.2 being 7-11, preferably 7-9; G is a monosaccharide residue; and x is 1-4, preferably 1 or 2. The use of the alkyl glucoside as a surfactant in a cleaning composition is also disclosed.
    Type: Grant
    Filed: November 14, 1995
    Date of Patent: October 28, 1997
    Assignee: Akzo Nobel NV
    Inventors: Ingegard Johansson, Lennart Dahlgren
  • Patent number: 5661121
    Abstract: An ethoxylate and a process of cleaning a hard surface with a low foaming detergent includes providing a low foaming detergent composed of the ethoxylate having a general formula which is selected from the group consisting of formula (I):C.sub.5 H.sub.11 CH(C.sub.3 H.sub.7)CH.sub.2 O(C.sub.2 H.sub.4 O).sub.n Hand formula (II):C.sub.5 H.sub.11 CH(C.sub.3 H.sub.7)CH.sub.2 O(C.sub.2 H.sub.4 O).sub.p (B).sub.r H,wherein n is 2-16, p is 1-10, r is 1-6, and B is an alkyleneoxy group having 3-4 carbon atoms; and cleaning the hard surface with the low foaming detergent.
    Type: Grant
    Filed: May 16, 1995
    Date of Patent: August 26, 1997
    Assignee: Berol Nobel AB
    Inventors: Lennart Dahlgren, Karin Bergstrom
  • Patent number: 5637025
    Abstract: A water activity toy including a main channel portion for a stream of water, and the channel having a siding which distends one side of the channel. A gate or wall is pivotally supported on a pivot post in the main channel and is operable between an upstream-downstream orientation, which directs the main water flow through the main channel portion for floating a vessel through the main channel portion and an orientation transverse to the main channel portion which diverts the main water flow into the siding and floats the vessel into the siding. The gate is also operable to the upstream-downstream orientation with the vessel in the siding for retaining the vessel in the siding. The siding may be a harbor for the vessel. An impeller moves the water in a stream through the main channel.
    Type: Grant
    Filed: December 12, 1995
    Date of Patent: June 10, 1997
    Assignee: Aquaplay AB
    Inventor: Lennart Dahlgren
  • Patent number: 5608118
    Abstract: An alkoxylate of 2-propyl heptanol having from 1 to 6 alkyleneoxy groups (B) adducted to the oxygen of the alcohol and from 1 to 10 ethylene oxide group adducted to the terminal alkyleneoxy group and having a general formula (I)C.sub.5 H.sub.11 CH(C.sub.3 H.sub.7)CH.sub.2 O(B).sub.r (C.sub.2 H.sub.4 O).sub.p H (I),wherein B is the alkyleneoxy group which has 3-4 carbon atoms, p is 1-10 and r is 1-6.
    Type: Grant
    Filed: May 16, 1995
    Date of Patent: March 4, 1997
    Assignee: Berol Nobel AB
    Inventors: Lennart Dahlgren, Karin Bergstr om
  • Patent number: 4919636
    Abstract: An educational water toy for children, which incorporates a first water tank (1) fitted to a base plate (2) and having at least one outlet opening (21, 22). The base plate further has additional water tanks (3, 4) provided below the outlet opening (21, 22) and preferably designed as figures (31, 41), which are freely pivotably supported about a pivot axis (33, 43) extending perpendicularly to the base plate (1), in such a manner, that it in unfilled condition is in a balanced position, and that in at least partly filled condition by means of unbalance pivots to a tilting position, in which it is emptied. By a repetition of this process a rocking motion is obtained.
    Type: Grant
    Filed: February 6, 1989
    Date of Patent: April 24, 1990
    Inventor: Lennart Dahlgren
  • Patent number: 4894041
    Abstract: A toy boat of the type where the hull (11) of the boat is constituted of a closed hollow body produced by means of blow moulding of a thermoplastic material in a mould, the parting line (13) of which is situated in the vertical longitudinal metacenter plane of the boat. The purpose is to provide a complete toy boat produced by means of the blow moulding method without movable cores and which boat hull in finished design present such details as gunwale, bulwark, tow hooks etcetera, which can have a colour contrasting to the colour of the boat hull.
    Type: Grant
    Filed: September 30, 1988
    Date of Patent: January 16, 1990
    Assignee: Aqua Toys AB
    Inventor: Lennart Dahlgren
  • Patent number: 4887893
    Abstract: A periscope, particularly a toy periscope formed of an elongated housing, having at one end portion an inlet opening in one side surface, and at the opposite, second end portion an outlet opening, and two deflection mirrors arranged in the interior of the housing at the two end portions thereof. To facilitate manufacture, the housing is formed of a one piece blow molded plastic material. Mirror holding elements are located in the inlet and outlet openings.
    Type: Grant
    Filed: March 11, 1988
    Date of Patent: December 19, 1989
    Inventor: Lennart Dahlgren
  • Patent number: 4044367
    Abstract: A roller-blind shutter having transverse depressions forming long plateaus in one of a pair of opening and closing shutters which exceed the length of the transverse depressions in the other of the curtains in the region in which they overlap on a spool when the shutter is cocked.
    Type: Grant
    Filed: October 14, 1975
    Date of Patent: August 23, 1977
    Assignee: Fritz Victor Hasselblad
    Inventor: Lennart Dahlgren
  • Patent number: 3954573
    Abstract: The present invention provides compositions and a process for the electroplating of metal or metal alloy coatings of high brightness on a base surface, and especially coatings of tin or tin-lead alloys having a high brightness. The compositions comprise a 2,4,6 -- substituted phenol, at least one substituent of which includes at least one secondary, tertiary or quaternary nitrogen atom or an alkylene oxide adduct of such phenol and, optionally, an aldehyde and/or a surface -- active compound.
    Type: Grant
    Filed: October 17, 1974
    Date of Patent: May 4, 1976
    Assignee: Berol Kemi AB
    Inventors: Karl Gustav Lennart Dahlgren, Frans Adam Kolosh