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International application No. Applicant's or agent's file reference
PCT/US2018/052254 111767-0196A
International filing date (day/month/year) (Earliest) Priority Date (day/month/year)
21 September 2018 25 September 2017
FOR FURTHER ACTION: See Form PCT/ISA/220 as well as, where applicable, item 5 below.
This international search report has been prepared by this International Searching Authority and is transmitted to the applicant according to Article 18. A copy is being transmitted to the International Bureau.
It is also accompanied by a copy of each prior art document cited in this report.
1. Basis of the report
a. With regard to the language, the international search was carried out on the basis of:
the international application in the language in which it was filed.
a translation of the international application into                                          which is the language of a translation furnished for the purposes of international search (Rules 12.3(a) and 23.1(b)).
This international search report has been established taking into account the rectification of an obvious mistake authorized by or notified to this Authority under Rule 91 (Rule 43.6bis(a)).
With regard to any nucleotide and/or amino acid sequence disclosed in the international application, the international search was carried out on the basis of a sequence listing:
2. Certain claims were found unsearchable
3. Unity of invention is lacking
4. Title of the invention
The text is approved as submitted by the applicant.
The text has been established by this Authority to read as follows:
5. Abstract
The text is approved as submitted by the applicant.
The text has been established, according to Rule 38.2, by this Authority as it appears in Box No. IV. The applicant may, within one month from the date of mailing of this international search report, submit comments to this Authority.

A diffuser system for a centrifugal compressor is provided.. The diffuser system includes a nozzle base plate (206) that defines a diffuser gap (212), support blocks (216, 246), and a drive ring (220) rotatable relative to the support blocks. The drive ring includes cam tracks (224, 242) and bearing assemblies (226, 234) positioned proximate an outer circumference of the drive ring. The diffuser system further includes drive pins (214) extending through the support blocks and the nozzle base plate. The first end of each drive pin includes a cam follower (218) mounted into a cam track on the drive ring. The second end of each drive pin is coupled to a diffuser ring (208). Rotation of the drive ring causes axial movement of the drive pins by movement of the cam followers in the cam tracks. This results in movement of the diffuser ring to control fluid flow through the diffuser gap.

6. Drawings
The figure of the drawings to be published with the abstract is Figure No.     1    
as suggested by the applicant.
as selected by this Authority, because the applicant failed to suggest a figure.
as selected by this Authority, because this figure better characterizes the invention.
none of the figures is to be published with the abstract.


     F04D 27/02 (2006.01)i; F04D 29/46 (2006.01)i
According to International Patent Classification (IPC) or to both national classification and IPC


Minimum documentation searched (classification system followed by classification symbols):
     F04D; F25B
Documentation searched other than minimum documentation to the extent that such documents are included in the fields searched:
Electronic data base consulted during the international search (name of data base and, where practicable, search terms used):
EPO-Internal, WPI Data


Category* Citation of document, with indication, where appropriate, of the relevant passages Relevant to claim No.
US 2008232950 A1 (STABLEY ROBERT E [US] ET AL) 25 September 2008 (2008-09-25)
paragraphs [0001], [0029], [0030]; figure 2
US 2004109757 A1 (NENSTIEL KURT [US]) 10 June 2004 (2004-06-10)
paragraph [0041]; figures 2-19
JP S54133613 A (HITACHI LTD) 17 October 1979 (1979-10-17)
abstract; figures 3,4
Special categories of cited documents:
document defining the general state of the art which is not considered to be of particular relevance
document cited by the applicant in the international application
earlier application or patent but published on or after the international filing date
document which may throw doubts on priority claim(s) or which is cited to establish the publication date of another citation or other special reason (as specified)
document referring to an oral disclosure, use, exhibition or other means
document published prior to the international filing date but later than the priority date claimed
later document published after the international filing date or priority date and not in conflict with the application but cited to understand the principle or theory underlying the invention
document of particular relevance; the claimed invention cannot be considered novel or cannot be considered to involve an inventive step when the document is taken alone
document of particular relevance; the claimed invention cannot be considered to involve an inventive step when the document is combined with one or more other such documents, such combination being obvious to a person skilled in the art
document member of the same patent family


Patent document cited in search report Publication date
Patent family member(s) Publication date
US 2008232950 A1
25 September 2008
AT 538313 T
EP 2129921 A1
TW 200842246 A
US 2008232950 A1
US 2011076131 A1
WO 2008118723 A1
15 January 2012
09 December 2009
01 November 2008
25 September 2008
31 March 2011
02 October 2008
US 2004109757 A1
10 June 2004
AU 2003293178 A1
CA 2507409 A1
CN 1745253 A
EP 1570181 A1
JP 4500687 B2
JP 5442398 B2
JP 2006509155 A
JP 2010031876 A
KR 20050085407 A
TW I238224 B
US 2004109757 A1
WO 2004053336 A1
30 June 2004
24 June 2004
08 March 2006
07 September 2005
14 July 2010
12 March 2014
16 March 2006
12 February 2010
29 August 2005
21 August 2005
10 June 2004
24 June 2004
JP S54133613 A
17 October 1979
JP S5947159 B2
JP S54133613 A
16 November 1984
17 October 1979
Name and mailing address of the ISA/:
European Patent Office
P.B. 5818, Patentlaan 2, 2280 HV Rijswijk,
Telephone No. (+31-70)340-2040
Facsimile No. (+31-70)340-3016
Date of the actual completion of the international search:
03 December 2018
Date of mailing of the international search report:
10 December 2018
Authorized officer:
de Martino, Marcello
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