Classifications

• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
  • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
  • G02B6/0005—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being of the fibre type
  • G02B6/001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being of the fibre type the light being emitted along at least a portion of the lateral surface of the fibre
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B82—NANOTECHNOLOGY
  • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
  • B82Y20/00—Nanooptics, e.g. quantum optics or photonic crystals
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
  • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
  • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
  • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
  • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
  • G02B6/02—Optical fibres with cladding with or without a coating
  • G02B6/02295—Microstructured optical fibre
  • G02B6/02314—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes
  • G02B6/02319—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes characterised by core or core-cladding interface features
  • G02B6/02338—Structured core, e.g. core contains more than one material, non-constant refractive index distribution in core, asymmetric or non-circular elements in core unit, multiple cores, insertions between core and clad
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
  • G02B6/02—Optical fibres with cladding with or without a coating
  • G02B6/02295—Microstructured optical fibre
  • G02B6/02314—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes
  • G02B6/02342—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes characterised by cladding features, i.e. light confining region
  • G02B6/02366—Single ring of structures, e.g. "air clad"

Definitions

• the disclosure generally relates to light diffusing optical fibers for use in illumination applications, and, more specifically, to light diffusing optical fibers and illumination devices utilizing such fibers.
• an illumination device includes a light source and at least one light diffusing optical fiber.
• the light source is coupled to the fiber and the numerical aperture of the light source is smaller than that of the fiber.
• the illumination device comprises: (i) a light diffusing optical fiber having a numerical aperture of NALDF, wherein said light diffusing optical fiber has an outer surface, two ends, a core, and a cladding, the fiber comprising a region with a plurality of scattering structures configured to scatter guided light via the scattering structures towards the outer surface providing scattering-induced attenuation greater than 50 dB/km at illumination wavelength, wherein said scatter guided light diffuses through said outer surface to provide illumination; (ii) a light source having a numerical aperture of NAsi, the light source being optically coupled to one end of said light diffusing optical fiber; such that NALDF - NA S1 >0.05.
• NA L DF-NA S I >0.02.
• the fiber is surrounded by a scattering coating or a jacket that improves angular scattering, and thus angular illumination.
• the illumination device comprises:
• a light diffusing optical fiber having a numerical aperture of NA L DF, wherein said light diffusing optical fiber has an outer surface, two ends, and a glass core comprising a region with a plurality of scattering structures within said core configured to scatter guided light via said scattering structures towards the outer surface providing scattering- induced attenuation greater than 50 dB/km at illumination wavelength, wherein said scatter guided light diffuses through said outer surface to provide illumination;
• a light source having a numerical aperture of NAsi, said light source being optically coupled to one end of said light diffusing optical fiber; NALDF - Asi >0.05.
• NA L DF-NA s1 >0.02. In some embodiments, 0.05 ⁇ NA S1 ⁇ 0.3and 0.31 ⁇ NALDF ⁇ 0.52. According to some embodiments the fiber is surrounded by a scattering coating or a jacket that improves angular scattering, and thus angular illumination.
• the illumination device provides a substantially uniform illumination due to scattering, such that the difference between the minimum and maximum scattering illumination intensity is less than 50% of the maximum scattering illumination intensity, for all viewing angles between 40 and 120 degrees.
• the illumination device comprises:
• said light diffusing optical fiber has an outer surface, two ends, and a glass core comprising a region with a plurality of nano-sized structures within said core configured to scatter guided light via said nano- sized structures towards the outer surface providing scattering-induced attenuation greater than 50 dB/km at illumination wavelength, wherein the scatter guided light diffuses through said outer surface to provide illumination; (ii) a light source having a numerical aperture of NAs 1; said light source being optically coupled to one end of said light diffusing optical fiber; and wherein NA LDF - NA S1 >0.02.
• the light source coupled to the fiber generates light in 200 nm to 500 nm wavelength range and fluorescent material in the fiber coating generates either white, green, red, blue, or NIR (near infrared) light. According to some embodiments the light source coupled to the fiber generates light in 200 nm to 1200 nm wavelength range.
• the illumination device includes a single light diffusing fiber.
• the illumination system includes a plurality of light diffusing fibers.
• the light diffusing fibers may be utilized in a straight configuration, or may be bent.
• the light diffusing fibers fiber may have scattering- induced attenuation between 100 dB/km and 60000 dB/km at illumination wavelength.
• NALDF - Asi >0.05.
• the illumination device further comprises a second light source.
• the second light souse is coupled to another end of the light diffusing optical fiber.
• the second light source has a numerical aperture of NAs 2 , wherein NA LDF - NA S2 >0.02.
• NA LD F - NA S2 >0.05.
• the illumination device further comprises a delivery fiber having a numerical aperture NAdeiivery, wherein (i) the light source is coupled to one end said delivery fiber and the light diffusing optical fiber is coupled to another end of said delivery fiber, and NAdeiive ⁇ NA L DF-
• the light diffusing optical fiber further comprises a light scattering/homogenizing coating surrounding the fiber cladding or a protective coating layer.
• the scattering/homogenizing coating may include at least one of the following scattering materials: titania, alumina, silica.
• Figures 1A and IB illustrate schematically two embodiments of illumination device that includes a light diffusing fiber.
• FIGs 2A through 2D are schematic illustrations of several embodiments of light diffusing fibers (LDF).
• LDF light diffusing fibers
• Figure 3 illustrates the modeled light intensity of one embodiment of illumination device, as light is propagating through 200 cm long length of light diffusing fiber.
• Figure 4 illustrates schematically another embodiment of light diffusing fiber.
• Figure 5 illustrates schematically another embodiment of the illumination device that includes a light diffusing fiber and two light sources coupled to the opposite ends of this fiber.
• Figure 6 illustrates schematically yet another embodiment of the illumination device that includes a light diffusing fiber, a light source coupled to one end of the fiber and a reflective surface situated on the other end of the fiber.
• Figure 7 is a plot of measured intensity along the length of light diffusing fiber of the illumination device of Figure 6.
• Figure 8 is a photograph of light diffusing fiber that corresponds to Figure 7.
• Figures 9A and 9B are schematic illustrations of the relative refractive index profiles exemplary embodiments of light diffusing fiber.
• each of the combinations A-E, A-F, B-D, B-E, B-F, C-D, C-E, and C-F are specifically contemplated and should be considered disclosed from disclosure of A, B, and/or C; D, E, and/or F; and the example combination A-D.
• any subset or combination of these is also specifically contemplated and disclosed.
• the sub-group of A-E, B-F, and C-E are specifically contemplated and should be considered disclosed from disclosure of A, B, and/or C; D, E, and/or F; and the example combination A-D.
• the indefinite article “a” or “an” and its corresponding definite article “the” as used herein means at least one, or one or more, unless specified otherwise.
• the “refractive index profile” is the relationship between the refractive index or the relative refractive index and the waveguide (fiber) radius.
• ⁇ ( ⁇ )% 100 X [n(r) 2 -nRE F 2 )]/2n(r) 2 ,
• n(r) is the refractive index at radius r, unless otherwise specified.
• the relative refractive index percent is defined at 850 nm unless otherwise specified.
• the reference index n EF is silica glass with the refractive index of 1.452498 at 850 nm.
• the reference index nREF is the maximum refractive index of the cladding glass at 850 nm.
• the relative refractive index is represented by ⁇ and its values are given in units of "%", unless otherwise specified.
• the relative index percent is negative and is referred to as having a depressed region or depressed-index, and the minimum relative refractive index is calculated at the point at which the relative index is most negative unless otherwise specified.
• the relative index percent is positive and the region can be said to be raised or to have a positive index.
• An "updopant” is herein considered to be a dopant which has a propensity to raise the refractive index relative to pure undoped Si0 2 .
• a “downdopant” is herein considered to be a dopant which has a propensity to lower the refractive index relative to pure undoped Si(3 ⁇ 4.
• An updopant may be present in a region of an optical fiber having a negative relative refractive index when accompanied by one or more other dopants which are not updopants.
• one or more other dopants which are not updopants may be present in a region of an optical fiber having a positive relative refractive index.
• a downdopant may be present in a region of an optical fiber having a positive relative refractive index when accompanied by one or more other dopants which are not downdopants.
• one or more other dopants which are not downdopants may be present in a region of an optical fiber having a negative relative refractive index.
• r 0 is the point at which ⁇ ( ⁇ ) is maximum
• i is the point at which ⁇ ( ⁇ )% is zero
• r is in the range ⁇ r ⁇ r f , where ⁇ is defined above, r; is the initial point of the a-profile, r f is the final point of the a-profile, and a is an exponent which is a real number.
• a is greater than 1.5 and less than 2.5, more preferably greater than 1.7 and 2.3 and even more preferably between 1.8 and 2.3 as measured at 850 nm.
• one or more segments of the refractive index profile have a substantially step index shape with an a value greater than 8, more preferably greater than 10, and even more preferably greater than 20 as measured at 850 nm.
• step- index profile includes refractive index profiles with constant refractive index in the core, at different radial position within the core.
• a desirable attribute of at least some of the embodiments of the present invention described herein is an illumination device that utilizes light diffusing fiber and provides uniform and high illumination along the length of the fiber.
• the intensity variation of the integrated (diffused ) light intensity coming through the sides of the fiber at the illumination wavelength is less than 20% for the target length of the fiber, which can be, for example, 0.02m - 100 m length (e.g., 0.2 m to 10 m).
• Such fibers could be used, for example, as replacements for other conventional lighting objects, but have the additional advantages of: (i) being much thinner than conventional light sources, and therefore can be used with thin illuminating substrates; and/or (ii) being able to function as a cool light source- i.e., the light diffusing fiber does not heat up while producing the required illumination- this feature is advantageous when the fibers 100, or fiber bundles or fiber ribbons containing such fibers are used in environments that have to stay cold, or in the areas where they are used as a light source that is easily accessible to children or others, without a threat of potentially burning someone when handled directly.
• a typical fiber system includes a light source coupled to a fiber where, in order to provide as much light intensity into the fiber core as possible, the light source has a numerical apertures equal to that of the optical fiber.
• the light source In typical light diffusing fibers, light escapes from the fiber core, and the intensity of light diffused out of the outer surface of such fiber is reduced as the light propagates along the length of the fiber, due to immediate exponential decay in the intensity of the light that is propagating through the core.
• the embodiments of the present invention disclosed herein solve this problem by providing light that is uniform in intensity, as a function of fiber length.
• an illumination device 1 includes at least one light diffusing optical fiber (LDF) 100 optically coupled to the light source 500.
• LDF light diffusing optical fiber
• the light diffusing optical fiber 100 has a glass core 110 with numerical aperture of NALDF, an outer surface, and two ends 100' and 100".
• the glass core 110 includes a region 116 with a plurality of scattering structures 100A (e.g., micro- or nano-sized structures) within the core, and the scattering structures 100A are configured to scatter guided light towards the outer surface, providing scattering-induced attenuation greater than 50 dB/km at the illumination wavelength.
• the scatter guided light diffuses through the outer surface of the fiber to provide illumination.
• the light source 500 of the illumination device 1 has a numerical aperture of NAsi, where NALDF > NAsi. While not being bound by theory, we realized that if a light source has a lower numerical aperture than the light diffusing optical fiber 100, then it takes a certain "diffusion distance" to completely fill the mode content of the light diffusing optical fiber 100.
• the low NA mode content of the light diffusing optical fiber 100 has a lower loss rate due to diffusivity than the higher NA modes. Therefore, because it takes a certain distance to completely fill the mode content of the light diffusing optical fiber 100, the brightness of at the beginning portion of the fiber (i.e., illumination provided by the LDF) does not immediately decrease with increasing fiber length due to light loss through diffusion. Instead, Applicants believe that as the mode content of light propagating through the fiber core increases, it compensates for the exponential decay in the intensity of light that is propagating through the core, achieving relatively uniform illumination along the fiber length.
• light source 500 may be is chosen such that NA LDF - NA S1 >0.02.
• NALDF > 0.3, for example between 0.3 and 0.5.
• NALDF may be 0.33, 0.35, 0.45, 0.48, 0.5 or therebetween.
• the difference between the numerical apertures between the light source(s) 500 and the fiber 100 and the choice of their NAs influences the length of the distance where the mode content of light diffusing optical fiber 100 becomes full.
• NA S1 ⁇ 0.3.
• NAsi ⁇ 0.2, and in some embodiments NAsi ⁇ 0.1.
• light source 500 comprises a light source component 500A coupled to the lens 500B.
• the light diffusing optical fiber 100 is thus optically coupled via fiber end 100' to a light source component 500A through the lens 500B.
• light source 500 comprises a light source component 500A coupled to the light delivery fiber 500C.
• the coupling between the light delivery fiber 500C and light diffusing optical fiber 100 can be done, for by a standard optical fiber coupler 500D, or by splicing the fiber end 100' of the light diffusing optical fiber 100 to the adjacent end of the delivery fiber 500C.
• the light diffusing optical fiber 100 is thus coupled via fiber end 100' to a light source component 500A via the delivery fiber 500C.
• a light diffusing fiber 100 may include one or more core regions with scattering structures, such as randomly distributed voids example.
• scattering structures such as randomly distributed voids example.
• Some examples of light- diffusing optical fibers having randomly arranged and randomly sized voids are described in U.S. Pat. No. 7,450,806, and in U.S. patent application Ser. No. 12/950,045, which patent and patent application are incorporated by reference herein.
• other scattering structures such as small light scattering particles, or dopants within the fiber core may also be utilized.
• Figure 3 illustrates the modeled light intensity, as light propagates through a 200 cm long light diffusing fiber 100.
• the core 110 includes a scattering region comprising scattering structures 100A (in this embodiment gas filled voids).
• the modeling was performed with the ray tracing software application ZEM AX, available from Radiant Zemax, LLC, of Redmond, WA, USA.
• the scattering region of the core (region 116) comprising the scattering structures 100A was modeled as a scattering volume
• the mirror 610 has a dielectric or metal coating reflective at the light source's wavelength (e.g., the wavelength provided by a laser diode, LD) and is glued to the tube 710.
• This simple fixture is attached to the ferrule, such that a cleaved and polished fiber tip touches the reflective surface 600.
• This exemplary embodiment of the reflective module 700 provides an effective and cost effective way of making end mirrors for lighting fixtures with single light a source for low cost LDF applications.
• Examples of these are, but not limited to, polyethylene, polypropylene, syndiotactic polystyrene, nylon, polyethylene terephthalate, polyketones, and polyurethanes where the urethane functional groups align and crystallize during solidification.
• polyethylene polypropylene
• syndiotactic polystyrene nylon
• polyethylene terephthalate polyethylene terephthalate
• polyketones polyurethanes where the urethane functional groups align and crystallize during solidification.
• polyurethanes align and crystallize during solidification.
• matrix materials such that the material mixture in the matrix becomes incompatible during cure or solidification, causing it to phase separate into droplets or particles that can scatter light, thus forming scattering sites.
• the scattering particles can be, for example, pigments, oxides, or mineral fillers. Both the organics and inorganicse scattering particles can be generated, for example, from grinding a solid, or as small particles initially (, for example, from emulsion polymerization or solgels).
• the solid scattering particles (or scattering agents) are inorganic oxides like silica, alumina, zirconia, titania, cerium oxide, tin oxide, and antimony oxide. Ground glass, ceramics, or glass-ceramics can also be utilized as scattering agents.
• unscattered light propagates down the light diffusing fiber 100 from the source in the direction shown by arrow 150.
• Scattered light is shown exiting the light diffusing fiber as arrow 160 at an angle 170, which describes the angular difference between the direction of the fiber and the direction of the scattered light when it leaves light diffusing fiber 100.
• angle 170 describes the angular difference between the direction of the fiber and the direction of the scattered light when it leaves light diffusing fiber 100.
• the visible, and/or near IR spectrum of the light diffusing fiber 100 is independent of angle 170.
• the intensities of the spectra when angle 170 is between 15° and 150°, or 30° and 130° are within ⁇ 50%, ⁇ 30%, ⁇ 25%, ⁇ 20%, ⁇ 15%, ⁇ 10%, or ⁇ 5% as measured at the peak wavelength.
• the illumination device 1 can provide uni orm angular illumination, as well as uniform illuminatio along the length of the fiber(s) 100.
• the light diffusing fiber can be constructed to produce uniform illumination along the entire length of the fiber or uniform illumination along a segment of the fiber which is less than the entire length of the fiber.
• uniform illumination when referring to the illumination along the length, as used herein, means that the intensity of light emitted from the light diffusing fiber does not vary by more than 25% over the specified length, L, where 0.1>L>100m. ⁇ 2 ⁇ ⁇
• the average scattering loss of the fiber is greater than 50 dB/km, and the scattering loss does not vary more than 20% (i.e., the scattering loss is within ⁇ 20% of the average scattering loss, for example within ⁇ 15%, or within ⁇ 10%) over any given fiber segment of 0.2 m length. In at least some embodiments, the average scattering loss of the fiber is greater than 50 dB/km, and the scattering loss does not vary more than 20% (i.e., the scattering loss is within ⁇ 20% of the average scattering loss, for example within ⁇ 15%, or even within ⁇ 10%) over any given fiber segment of 0.5 m length.
• the average scattering loss of the fiber is greater than 50 dB/km, and the scattering loss does not vary more than 20% (i.e., the scattering loss is within ⁇ 20% of the average scattering loss, for example within ⁇ 15%, or within ⁇ 10%o) over any given fiber segment of 1 m length. In at least some embodiments, the average scattering loss of the fiber is greater than 50 dB/km, and the scattering loss does not vary more than 20% (i.e., the scattering loss is within ⁇ 20% of the average scattering loss, for example within ⁇ 15%, or within ⁇ 10%) over any given fiber segment of 3 m length.
• the average scattering loss of the fiber is greater than 50 dB/km, and the scattering loss does not vary more than 20% (i.e., the scattering loss is within ⁇ 20% of the average scattering loss, for example within ⁇ 15%, or within ⁇ 10%) over any given fiber segment of 5 m length. In at least some embodiments, the average scattering loss of the fiber is greater than 50 dB/km, and the scattering loss does not vary more than 15% (i.e., the scattering loss is within ⁇ 15% of the average scattering loss, for example within ⁇ 10%, or within ⁇ 5%) over any given fiber segment of 10 m length.
• the average scattering loss of the fiber is greater than 50 dB/km, and the scattering loss does not vary more than 20% (i.e., the scattering loss is within ⁇ 20% of the average scattering loss, for example within ⁇ 15%, or within ⁇ 10%) over any given fiber segment of 0.2m >L> 10m, 0.2m >L> 20m or 0.2 m>L> 50 m length.
• FIGs. 9A and 9B are schematic a plot of exemplary refractive index versus fiber radius for an example fiber 100 shown in FIG. 2A.
• the core 110 may have a graded core profile, characterized, for example, by an a- value between 1.7 and 2.3 (e.g., 1.8 to 2.3).
• the core region 112 extends radially outwardly from the centerline to its outer radius, Rl, and has a relative refractive index profile Ai(r) corresponding to a maximum refractive index nl (and relative refractive index percent AiMAx).
• the reference index n £p is the refractive index at the cladding.
• core regions 112, 118 have a substantially constant refractive index profile, as shown in FIG. 9B with a constant ⁇ 1 (r) and ⁇ 3( ⁇ ).
• ⁇ 2( ⁇ ) is either slightly positive (e.g., 0 ⁇ ⁇ 2( ⁇ ) ⁇ 0.1%), negative (e.g., -0.1% ⁇ ⁇ 2( ⁇ ) ⁇ 0), or 0%.
• the absolute magnitude of ⁇ 2( ⁇ ) is less than 0.1 %, preferably less than 0.05%.
• the outer cladding region 120 has a substantially constant refractive index profile, as shown in FIG. 9B, with a constant ⁇ 4( ⁇ ).
• the cladding 120 when cladding 120 is utilized, the cladding 120
• the cladding 120 comprises pure low index polymer.
• scattering region 116 is nano-structured region that a comprises pure silica comprising a plurality of voids 116'.
• the minimum relative refractive index and the average effective relative refractive index, taking into account the presence of any voids, of nano-structured scattering region 116 are both less than -0.1%.
• the outer radius Rc of the core is greater than 30 ⁇ and/or less than 400 ⁇ .
• Rc may be 125 ⁇ to 300 ⁇ .
• the central portion 112 of the core 110 has a radius that is O.lRc ⁇ R ⁇ ⁇ 0.9Rc, preferably 0.5Rc ⁇ R 1 ⁇ 09Rc.
• the width W2 of the scattering region 116 (in this embodiment the width of the nano- structured region) is preferably 0.05Rc ⁇ W2 ⁇ 0.9Rc, preferably O.lRc ⁇ W2 ⁇ 0.9Rc, and in some embodiments 0.5Rc ⁇ W2 ⁇ 0.9Rc (a wider nano-structured region gives a higher scattering-induced attenuation, for the same density of nano-sized structures).
• Each section of the core 110 comprises silica based glass.
• the radial width W 2 of nano-structured scattering region 116 is preferably greater than 1 ⁇ .
• the numerical aperture (NA) of fiber 100 is equal to or greater than the NA of a light source directing light into the fiber.
• NA numerical aperture
• the numerical aperture (NA) of fiber 100 is greater than 0.2, in some embodiments greater than 0.3, and more preferably greater than 0.4.
• the cladding 120 has a relative refractive index profile ⁇ 4( ⁇ ) having a maximum absolute magnitude less than 0.1%, and in this embodiment ⁇ 4 ⁇ ⁇ 0.05% and ⁇ 4 ⁇ > -0.05.

Landscapes

• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Optics & Photonics (AREA)
• Optical Couplings Of Light Guides (AREA)
• Light Guides In General And Applications Therefor (AREA)
• Semiconductor Lasers (AREA)
• Chemical & Material Sciences (AREA)
• Crystallography & Structural Chemistry (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=50983198

Family Applications (1)

Country Status (4)

Families Citing this family (44)

Citations (5)

Family Cites Families (10)

• 2014
  • 2014-05-15 US US14/278,349 patent/US9618672B2/en not_active Expired - Fee Related
  • 2014-05-27 WO PCT/US2014/039483 patent/WO2014193773A1/en not_active Ceased
  • 2014-05-27 JP JP2016516711A patent/JP6483095B2/ja not_active Expired - Fee Related
  • 2014-05-27 EP EP14732755.5A patent/EP3004730B1/en not_active Not-in-force

Patent Citations (5)

Also Published As

Similar Documents

Legal Events