Recherche dans les collections de brevets nationales et internationales
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Part 1:  1  2  3  4  5  6          Part 2:  A  B  C  D  E 
International application No. Applicant's or agent's file reference
PCT/US2015/017303 MITX689601WO
International filing date (day/month/year) (Earliest) Priority Date (day/month/year)
24 February 2015 25 February 2014
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
This International Searching Authority found multiple inventions in this international application, as follows:
1. claims: 1-12, 14-20
An i th thickness ai of the at least one multilayer cell in an ith photonic crystal structure satisfies ai= a1qi-1 , where i is an integer between 1 and 2000 and q is a positive number greater than one. This feature permits to cover a wide range of electromagnetic spectrum.
2. claim: 13
A first ratio of the first dielectric permittivity to a first permeability of the first layer is substantially equal to a second ratio of the second dielectric permittivity to a second permeability of the second layer. It is not yet clear what problem is solved by this feature.
3. claims: 21, 22
The first layer comprises a porous material and the first dielectric permittivity is substantially equal to one. This solves the problem of air compatibility.
4. claim: 23
A total number of multilayer cells in the plurality of photonic crystal structure is greater than 300. This characteristic improves the accuracy of the device.
5. claims: 24-38
A plurality of multilayer cells disposed substantially along a surface normal direction of the filter, at least one multilayer cell in the plurality of multilayer cells comprising an isotropic sheet and an anisotropic sheet.
As all required additional search fees were timely paid by the applicant, this international search report covers all searchable claims.
As all searchable claims could be searched without effort justifying additional fees, this Authority did not invite payment of additional fees.
As only some of the required additional search fees were timely paid by the applicant, this international search report covers only those claims for which fees were paid, specifically claims Nos.:
No required additional search fees were timely paid by the applicant. Consequently, this international search report is restricted to the invention first mentioned in the claims; it is covered by claims Nos.: 1-12, 14-20
Remark on Protest
The additional search fees were accompanied by the applicant’s protest and, where applicable, the payment of a protest fee.
The additional search fees were accompanied by the applicant’s protest but the applicable protest fee was not paid within the time limit specified in the invitation.
No protest accompanied the payment of additional search fees.
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.     3a    
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.


     G02B 5/20 (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:
Electronic data base consulted during the international search (name of data base and, where practicable, search terms used):
EPO-Internal, INSPEC, WPI Data


Category* Citation of document, with indication, where appropriate, of the relevant passages Relevant to claim No.
WO 2012012450 A1 (MASSACHUSETTS INST TECHNOLOGY [AE]; HAMAM RAFIF E [CA]; BERMEL PETER [) 26 January 2012 (2012-01-26)
page 8, line 20 - page 11, line 9
page 12, line 29 - page 17, line 30
figure 1A
BANERJEE A ET AL, "Design of a tunable ultraviolet filter using metallodielectric photonic crystal", APPLIED ELECTROMAGNETICS CONFERENCE, 2007. AEMC 2007. IEEE, IEEE, PISCATAWAY, NJ, USA,19 December 2007 (2007-12-19), page 1-4,
ISBN: 9781424418633
the whole document
XIAOYONG HU ET AL, "A multichannel filter in a photonic crystal heterostructure containing single-negative materials", JOURNAL OF OPTICS. A, PURE AND APPLIED OPTICS, INSTITUTE OF PHYSICS PUBLISHING, BRISTOL, GB,Vol. 9, No. 10, 01 October 2007 (2007-10-01), page 877-883,
the whole document
JOMTARAK R ET AL, "Geometrically Distributed 1D Photonic Crystals for Light-Reflection in All Angles", 24 March 2012 (2012-03-24), Vol. 32, page 455-460,
[retrieved on  2012-03-24]
the whole document
US 2012325299 A1 (DE CEGLIA DOMENICO [US] ET AL) 27 December 2012 (2012-12-27)
paragraph [0032] - paragraph [0040]
figure 1A
WO 2013054115 A1 (LAMDA GUARD CANADA INC [CA]; PALIKARAS GEORGE [GB]; KALLOS THEMOS [GB]) 18 April 2013 (2013-04-18)
page 10, line 28 - page 14, line 32
figure 6
CN 101431109 A (USTC UNIV SCIENCE TECH CN [CN]) 13 May 2009 (2009-05-13)
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
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
WO 2012012450 A1
26 January 2012
US 2012037217 A1
WO 2012012450 A1
16 February 2012
26 January 2012
US 2012325299 A1
27 December 2012
US 2012325299 A1
US 2015364634 A1
27 December 2012
17 December 2015
WO 2013054115 A1
18 April 2013
CA 2851347 A1
CN 104067149 A
EP 2748655 A1
JP 2014534459 A
US 2014293467 A1
WO 2013054115 A1
18 April 2013
24 September 2014
02 July 2014
18 December 2014
02 October 2014
18 April 2013
CN 101431109 A
13 May 2009
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:
11 November 2015
Date of mailing of the international search report:
25 January 2016
Authorized officer:
Boubal, François
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