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US6202945: Method and apparatus for electrostatic powder coating


Filing Information

Inventor(s) Shinichiro Yasuda · Masayuki Maruta · Yukiya Sato ·
Assignee(s) Kao Corporation ·
Attorney/Agent(s) Birch, Stewart, Kolasch & Birch, LLP ·
Primary Examiner Andres Kashnikow ·
Assistant Examiner Robin O. Evans ·
Application Number US9134351
Filing date 08/14/1998
Issue date 03/20/2001
Predicted expiration date 04/22/2017
U.S. Classifications 239/704  · 239/708  · 239/706  · 239/692  · 239/427.3  · 239/432  · 239/690  ·
International Classifications --
Kind CodeB1
International Classifications 2394273 · 2394275 · 239432 · 239690 · 239697 · 239698 · 239692 · 239704 · 239706 · 239707 · 239708 ·
Related U.S. Application DataThis application is a divisional of application Ser. No. 08/844,775, filed on Apr. 22, 1997, now U.S. Pat. No. 5,811,158, the entire contents of which are hereby incorporated by reference.
2 Claims, 2 Drawings


While plural kind of powder paints of different hues are mixed with each other without melting for preparation of a powder paint of a desire hue, a fluidity improver possessing a charge control function is simultaneously mixed into the powder paints without melting. The mixed powder paint containing the fluidity improver is charged, and then electrostatic powder coating is performed by the charged powder paint.

Independent Claims | See all claims (2)

  1. 1. An electrostatic powder coating apparatus, comprising: a body; plural powder paint inlets formed in the body; a fluidity improver inlet formed in the body; an outlet formed in the body; and a transportation path within the body for communicating each of the inlets with the outlet; wherein the transportation path has a mixing space and a charging space positioned in the downstream side of the mixing space; wherein means for mixing powder paints, which are introduced from the powder paint inlets, and a fluidity improver, which is introduced from the fluidity improver inlet, is provided in the mixing space; wherein means for charging the mixed powder paint containing the fluidity improver is provided in the charging space; and wherein the charged powder paint can be blown out from the outlet.

References Cited

U.S. Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
US2477947* ELECTRONIC DUSTING CORP Yadoff Aug 1949
US3903321 SCHAAD HANS J Schaad Sep 1975
US4248744 Inmont Corporation Masar et al. Feb 1981
US4302481* Gema AG Ribnitz et al. Nov 1981
US4908825 Northern Telecom Limited Niimura et al. Mar 1990
US5073579 Hoechst Aktiengesellschaft Macholdt et al. Dec 1991
US5319001 Courtaulds Coating (Holdings) United Morgan et al. Jun 1994
US5397605* Barbieri Mar 1995

Foreign Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
DEA13232088Mar 1984
EPA10306799Mar 1989
FR2682309PROTIME SAApr 1993
JP4504431Aug 1992
WO199006345Jun 1990
WO199411446May 1994
* cited by examiner

Referenced By

Patent Family

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