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International application No. Applicant's or agent's file reference
PCT/US2015/021039 063718.3403
International filing date (day/month/year) (Earliest) Priority Date (day/month/year)
17 March 2015
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.
6. Drawings
The figure of the drawings to be published with the abstract is Figure No.     1A    
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.


     E21B 49/08 (2006.01)i; E21B 47/00 (2012.01)i; G01N 11/00 (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):
Documentation searched other than minimum documentation to the extent that such documents are included in the fields searched:
Korean utility models and applications for utility models
Japanese utility models and applications for utility models
Electronic data base consulted during the international search (name of data base and, where practicable, search terms used):
eKOMPASS(KIPO internal) & Keywords: drilling fluid, viscosity, measurement, rotor, cup, bob, region, sensor, shaft and torque transducer


Category* Citation of document, with indication, where appropriate, of the relevant passages Relevant to claim No.
US 2001-0042400 A1 (BOYLE et al.) 22 November 2001 See paragraphs [0030]-[0056] and figures 1-7.
EP 0734515 B1 (BAKER HUGHES INCORPORATED) 10 April 2002 See paragraphs [0012]-[0020] and figure 1.
US 4299118 A (GAU et al.) 10 November 1981 See claims 1-14 and figure 1.
US 4557142 A (HENSLEY et al.) 10 December 1985 See claims 1-19 and figure 1.
US 4484468 A (GAU et al.) 27 November 1984 See column 3, line 19-column 4, line 24 and figure 1.
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 2001-0042400 A1
22 November 2001
US 6231646 B1
US 6412338 B2
15 May 2001
02 July 2002
EP 0734515 B1
10 April 2002
AU 5706094 A
EP 0734515 A1
NO 316702 B1
NO 962563 A
US 5763766 A
US 6070457 A
WO 95-16905 A1
03 July 1995
02 October 1996
13 April 2004
09 August 1996
09 June 1998
06 June 2000
22 June 1995
US 4299118 A
10 November 1981
CA 1150974 A1
DE 3042803 A1
FR 2472746 A1
GB 2067296 A
IT 1134342 B
NO 803471 A
02 August 1983
01 October 1981
03 July 1981
22 July 1981
13 August 1986
17 August 1981
US 4557142 A
10 December 1985
EP 0211112 A1
25 February 1987
US 4484468 A
27 November 1984
Name and mailing address of the ISA/:
Korean Intellectual Property Office
189 Cheongsa-ro, Seo-gu, Daejeon Metropolitan City, 302-701
Republic of Korea
Facsimile No. +82-42-472-7140
Date of the actual completion of the international search:
02 December 2015
Date of mailing of the international search report:
03 December 2015
Authorized officer:
LEE, Jong Kyung
Telephone No. +82-42-481-3360
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