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International application No. Applicant's or agent's file reference
PCT/EP2019/080306 AF P15101WO
International filing date (day/month/year) (Earliest) Priority Date (day/month/year)
06 November 2019 03 December 2018
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 drill string (400) for rotary drilling of underground mining machines including a first elongate drill string member (100) and a second elongate drill string member (100). The first member has a main section (101) and a male end (102), the second member has a main section (101) and a female end (103). The male (102) and female (103) ends have respective threads to provide a thread coupling (401) between the male (102) and female (103) ends, the thread coupling enables the male end (102) to be secured inside the female end (103) such that the male and female ends overlap axially, wherein a thread lead (L2) of the respective threads of the male and the female ends is greater than a diameter (DM, DFI) of the male end (102) and the female end (103).

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 17/00 (2006.01)i; E21B 17/04 (2006.01)i; E21B 17/042 (2006.01)i; F16L 15/06 (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):
     E21B; F16L
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):


Category* Citation of document, with indication, where appropriate, of the relevant passages Relevant to claim No.
GB 1111995 A (SANDVIKENS JERNVERKS AB) 01 May 1968 (1968-05-01)
column 3, lines 72-92; figures 1, 2
EP 0187628 A2 (SANTRADE LTD [CH]) 16 July 1986 (1986-07-16)
the whole document
WO 2004003334 A1 (SANDVIK AB [SE]) 08 January 2004 (2004-01-08)
the whole document
GB 1564473 A (PADLEY & VENABLES LTD) 10 April 1980 (1980-04-10)
the whole document
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
GB 1111995 A
01 May 1968
CA 921510 A
FR 1434083 A
GB 1111995 A
NO 127937 B
US RE27284 E
US 3388935 A
20 February 1973
01 April 1966
01 May 1968
03 September 1973
15 February 1972
18 June 1968
EP 0187628 A2
16 July 1986
AT 46212 T
AU 5149785 A
BR 8600006 A
CA 1250455 A
CN 86100022 A
DE 3572856 D1
EP 0187628 A2
FI 855186 A
IE 57151 B1
JP H0682191 U
JP S61176791 A
NO 170234 B
SE 459681 B
US 4760887 A
15 September 1989
10 July 1986
23 September 1986
28 February 1989
03 December 1986
12 October 1989
16 July 1986
08 July 1986
06 May 1992
25 November 1994
08 August 1986
15 June 1992
24 July 1989
02 August 1988
WO 2004003334 A1
08 January 2004
AU 2003245195 A1
CA 2483951 A1
CN 1662726 A
EP 1516102 A1
HK 1079262 A1
JP 4485944 B2
JP 2005530944 A
KR 20050008786 A
RU 2302506 C2
SE 520077 C2
US 2004050592 A1
WO 2004003334 A1
ZA 200408788 B
19 January 2004
08 January 2004
31 August 2005
23 March 2005
23 November 2007
23 June 2010
13 October 2005
21 January 2005
10 July 2007
20 May 2003
18 March 2004
08 January 2004
26 July 2006
GB 1564473 A
10 April 1980
GB 1564473 A
ZA 7707388 B
10 April 1980
25 October 1978
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:
04 March 2020
Date of mailing of the international search report:
12 March 2020
Authorized officer:
Manolache, Iustin
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