US4373768A — Thermostatic fiber optic waveguides

Claim 1

Independent Claim 89 words

A waveguide comprising two connected sections, a first section and a second section, the first section comprising a first solid core and a first solid cladding disposed on and around the exterior surface of the first core, and the second section comprising a second solid core and a second solid cladding disposed on and around the exterior surface of the second core, the first section of the waveguide exhibiting blackout at a first temperature T 1 , the second section being capable of transmitting light at T 1 .

Claim 2

Dependent Claim 89 words

A waveguide comprising two connected sections, a first section and a second section, the first section comprising a first solid core and a first solid cladding disposed on and around the exterior surface of the first core, and the second section comprising a second solid core and a second solid cladding disposed on and around the exterior surface of the second core, the first section of the waveguide exhibiting blackout at a first temperature T 1 , the second section being capable of transmitting light at T 1 .

Claim 3

Dependent Claim 19 words

The waveguide of claim 1 in which the first core and the second core are of the same material.

Claim 4

Dependent Claim 36 words

The waveguide of claim 1 or 2 in which the second section of the waveguide exhibits blackout at a second temperature T 2 , the first section being capable of transmitting light at T 2 .

Claim 5

Dependent Claim 59 words

The waveguide of claim 1 or 2 including a third section comprising a third core and a third cladding disposed on and around the exterior surface of the third core, the third section of the waveguide exhibiting blackout at a third temperature T 3 , the first and second sections being capable of transmitting light at T 3 .

Claim 6

Dependent Claim 19 words

The waveguide of claim 4 in which the first, second and third cores are all of the same material.

Claim 7

Dependent Claim 85 words

A waveguide comprising a plurality of sensing elements separated from each other by light transmitting elements, each sensing element comprising a solid sensing core and a solid sensing cladding disposed on and around the exterior surface of the sensing core, and each light transmitting element comprising a solid transmitting core and a solid transmitting cladding disposed on and around the exterior surface of the transmitting core, each sensing element exhibiting blackout at a temperature at which the light transmitting elements are capable of transmitting light.

Claim 8

Dependent Claim 85 words

A waveguide comprising a plurality of sensing elements separated from each other by light transmitting elements, each sensing element comprising a solid sensing core and a solid sensing cladding disposed on and around the exterior surface of the sensing core, and each light transmitting element comprising a solid transmitting core and a solid transmitting cladding disposed on and around the exterior surface of the transmitting core, each sensing element exhibiting blackout at a temperature at which the light transmitting elements are capable of transmitting light.

Claim 9

Dependent Claim 26 words

The waveguide of claim 6 in which the cores of the sensing elements and the cores of the light transmitting elements are of the same material.

Claim 10

Dependent Claim 30 words

The waveguide of claim 6 in which the core of at least one sensing element and the core of at least one light transmitting element are of the same material.

Claim 11

Dependent Claim 9 words

The waveguide of claim 6 comprising two sensing elements.

Claim 12

Dependent Claim 21 words

The waveguide of claim 6 in which at least one sensing element has a different blackout temperature than another sensing element.

Claim 13

Dependent Claim 17 words

The waveguide of claim 6 in which all the sensing elements have cores of the same material.

Claim 14

Dependent Claim 19 words

The waveguide of claim 6 or 11 in which the light transmitting elements have cores of the same material.

Claim 15

Dependent Claim 51 words

A waveguide comprising a solid core and a first section of solid cladding disposed on and around the exterior surface of the core, and a second section of solid cladding disposed on and around the exterior surface of the core, the first section and the second section being of different compositions.

Claim 16

Dependent Claim 51 words

A waveguide comprising a solid core and a first section of solid cladding disposed on and around the exterior surface of the core, and a second section of solid cladding disposed on and around the exterior surface of the core, the first section and the second section being of different compositions.

Claim 17

Dependent Claim 78 words

The waveguide of claim 13 in which the refractive indices of both sections of cladding are less than the refractive index of the core at all temperatures less than a temperature T 1 , and at temperatures greater than T 1 the refractive index of the first section of cladding is greater than the refractive index of the core while the refractive index of the second section of cladding remains less than the refractive index of the core.

Claim 18

Dependent Claim 79 words

The waveguide of claim 13 in which the refractive indices of both sections of cladding are less than the refractive index of the core at all temperatures greater than a temperature T 1 , and at temperatures less than T 1 , the refractive index of the first section of cladding is greater than the refractive index of the core while the refractive index of the second section of cladding remains less than the refractive index of the core.

Claim 19

Independent Claim 118 words

A method for preparing a waveguide comprising a core and a first section of solid cladding disposed on and around the exterior surface of the core and a second section of solid cladding disposed on and around the exterior surface of the core, the first section comprising a first material and the second section comprising a second material, the first and second materials being different, the method comprising the steps of: (a) fabricating a waveguide comprising a solid core and a first solid cladding comprising the first material; (b) removing a section of the first solid cladding; and (c) curing the second solid cladding in situ on the section of the core with the first cladding removed therefrom.

Claim 20

Independent Claim 118 words

A method for preparing a waveguide comprising a core and a first section of solid cladding disposed on and around the exterior surface of the core and a second section of solid cladding disposed on and around the exterior surface of the core, the first section comprising a first material and the second section comprising a second material, the first and second materials being different, the method comprising the steps of: (a) fabricating a waveguide comprising a solid core and a first solid cladding comprising the first material; (b) removing a section of the first solid cladding; and (c) curing the second solid cladding in situ on the section of the core with the first cladding removed therefrom.

Claim 21

Independent Claim 127 words

A method for preparing a waveguide comprising a solid core and a first section of solid cladding disposed on and around the exterior surface of the core and a second section of solid cladding disposed on and around the exterior surface of the core, the first section comprising a first material and the second section comprising a second material, the first and second materials being different, the method comprising the steps of: (a) fabricating a waveguide comprising a solid coare and a first solid cladding comprising the first material; (b) removing a section of the first solid cladding; and (c) heat shrinking a heat-recoverable sleeve onto the section of the core with the first cladding removed therefrom, the sleeve having an insert of the second solid cladding.

Claim 22

Independent Claim 127 words

A method for preparing a waveguide comprising a solid core and a first section of solid cladding disposed on and around the exterior surface of the core and a second section of solid cladding disposed on and around the exterior surface of the core, the first section comprising a first material and the second section comprising a second material, the first and second materials being different, the method comprising the steps of: (a) fabricating a waveguide comprising a solid coare and a first solid cladding comprising the first material; (b) removing a section of the first solid cladding; and (c) heat shrinking a heat-recoverable sleeve onto the section of the core with the first cladding removed therefrom, the sleeve having an insert of the second solid cladding.

Claim 23

Independent Claim 116 words

A method for preparing a waveguide comprising a solid core and a first section of solid cladding disposed on and around the exterior surface of the core and a second section of solid cladding disposed on and around the exterior surface of the core, the first section comprising a first material and the second section comprising a second material, the first and second materials being different, the method comprising the steps of: (a) fabricating a waveguide comprising a solid core and a first solid cladding comprising the first material; and (b) doping a section of the first solid cladding with a dopant that alters the refractive index of the first cladding, thereby forming the second material.

Claim 24

Independent Claim 116 words

A method for preparing a waveguide comprising a solid core and a first section of solid cladding disposed on and around the exterior surface of the core and a second section of solid cladding disposed on and around the exterior surface of the core, the first section comprising a first material and the second section comprising a second material, the first and second materials being different, the method comprising the steps of: (a) fabricating a waveguide comprising a solid core and a first solid cladding comprising the first material; and (b) doping a section of the first solid cladding with a dopant that alters the refractive index of the first cladding, thereby forming the second material.

Claim 25

Independent Claim 129 words

A method for detecting fires comprising the steps of: (a) placing at least part of a waveguide in a position proximate to a combustible material so that the temperature of the waveguide is higher than ambient temperature when the combustible material is on fire, the waveguide comprising a fiber core and a cladding disposed on and around the exterior surface of the core, the waveguide exhibiting blackout when the temperature of said part is at a blackout temperature that is higher tham ambient temperature but less than 200° C.; (b) directing light at an end of the waveguide; (c) monitoring the intensity of light transmitted by the waveguide, the onset of a substantial change in intensity indicating that the combustible material is on fire; and (d) stopping the fire.

Claim 26

Independent Claim 129 words

A method for detecting fires comprising the steps of: (a) placing at least part of a waveguide in a position proximate to a combustible material so that the temperature of the waveguide is higher than ambient temperature when the combustible material is on fire, the waveguide comprising a fiber core and a cladding disposed on and around the exterior surface of the core, the waveguide exhibiting blackout when the temperature of said part is at a blackout temperature that is higher tham ambient temperature but less than 200° C.; (b) directing light at an end of the waveguide; (c) monitoring the intensity of light transmitted by the waveguide, the onset of a substantial change in intensity indicating that the combustible material is on fire; and (d) stopping the fire.

Claim 27

Dependent Claim 44 words

A waveguide comprising a solid core and a solid cladding disposed on and around the exterior surface of the core, at least a portion of the waveguide exhibiting blackout at a blackout temperature greater than about -20° C. and less than about 200° C.

Claim 28

Dependent Claim 44 words

A waveguide comprising a solid core and a solid cladding disposed on and around the exterior surface of the core, at least a portion of the waveguide exhibiting blackout at a blackout temperature greater than about -20° C. and less than about 200° C.

Claim 29

Dependent Claim 14 words

The waveguide of claim 20 wherein said portion exhibits blackout at about 0° C.

Claim 30

Dependent Claim 20 words

The waveguide of claim 20 or 21 wherein said portion exhibits blackout at a temperature less than about 100° C.

Claim 31

Dependent Claim 39 words

The waveguide of claim 20 wherein at temperatures greater than the blackout temperature, said portion is capable of transmitting light without substantial attenuation and at temperatures less than the blackout temperature, said portion is not capable of transmitting light.

Claim 32

Dependent Claim 39 words

The waveguide of claim 20 wherein at temperatures less than the blackout temperature, said portion is capable of transmitting light without substantial attenuation and at temperatures greater than the blackout temperature, said portion is not capable of transmitting light.

Claim 33

Dependent Claim 58 words

The waveguide of claim 20 wherein at least a portion of the waveguide is capable of transmitting light with a first attenuation at temperatures less than the blackout temperature and is capable of transmitting light with a second attentuation at temperatures greater than the blackout temperature, the first and second attenuation differing by at least about 3 dB.

Claim 34

Dependent Claim 46 words

The waveguide of claim 20 wherein at least two portions of the waveguide exhibit blackout at a blackout temperature greater than about -20° C. and less than about 200° C., said portions being separated by a portion that does not exhibit blackout at the selected temperature.

Claim 35

Dependent Claim 81 words

A waveguide comprising a solid core and a solid cladding disposed on and around the core, the index of refraction of the cladding being greater than or equal to the index of refraction of the core at temperatures of T 1 and less, T 1 being greater than about -20° C., and less than about 200° C., the index of refraction of the cladding being less than the index of refraction of the core at temperatures greater than T 1 .

Claim 36

Dependent Claim 81 words

A waveguide comprising a solid core and a solid cladding disposed on and around the core, the index of refraction of the cladding being greater than or equal to the index of refraction of the core at temperatures of T 1 and less, T 1 being greater than about -20° C., and less than about 200° C., the index of refraction of the cladding being less than the index of refraction of the core at temperatures greater than T 1 .

Claim 37

Dependent Claim 12 words

The waveguide of claim 27 wherein T 1 is about 0° C.

Claim 38

Dependent Claim 13 words

The waveguide of claim 27 wherein T 1 is greater than 0° C.

Claim 39

Dependent Claim 70 words

A waveguide comprising a core and cladding disposed thereon, the cladding having a crystalline melting point greater than -20° C., the refractive index of the cladding being less than the refractive index of the core at temperatures greater than the crystalline melting point of the cladding and being greater than or equal to the refractive index of the core at temperatures less than or equal to the crystalline melting point.

Claim 40

Dependent Claim 70 words

A waveguide comprising a core and cladding disposed thereon, the cladding having a crystalline melting point greater than -20° C., the refractive index of the cladding being less than the refractive index of the core at temperatures greater than the crystalline melting point of the cladding and being greater than or equal to the refractive index of the core at temperatures less than or equal to the crystalline melting point.

Claim 41

Dependent Claim 17 words

The waveguide of claim 30 in which the cladding comprises a copolymer of dimethylsiloxane and ethylene oxide.

Claim 42

Dependent Claim 14 words

The waveguide of claim 30 in which the cladding comprises a cross-linked polydialkyl siloxane.

Claim 43

Dependent Claim 110 words

A waveguide comprising a core and cladding disposed on and around the exterior surface of the core, the cladding comprising a polyalkylphenyl siloxane, the refractive index of the cladding being less than the refractive index of the core at temperatures greater than a temperature T 1 , the polyalkylphenyl siloxane containing sufficient phenyl that at temperatures less than T 1 , the refractive index of the cladding is greater than the refractive index of the core so that the waveguide exhibits blackout at T 1 and is capable of transmitting light without substantial attenuation at temperatures greater than T 1 , wherein T 1 is no higher than 15° C.

Claim 44

Dependent Claim 110 words

A waveguide comprising a core and cladding disposed on and around the exterior surface of the core, the cladding comprising a polyalkylphenyl siloxane, the refractive index of the cladding being less than the refractive index of the core at temperatures greater than a temperature T 1 , the polyalkylphenyl siloxane containing sufficient phenyl that at temperatures less than T 1 , the refractive index of the cladding is greater than the refractive index of the core so that the waveguide exhibits blackout at T 1 and is capable of transmitting light without substantial attenuation at temperatures greater than T 1 , wherein T 1 is no higher than 15° C.

Claim 45

Dependent Claim 13 words

The waveguide of claim 33 in which the cladding comprises a polymethylphenyl siloxane.

Claim 46

Dependent Claim 29 words

The waveguide of claim 34 in which the phenyl content of the polymethylphenyl siloxane is at least about 15% by weight based upon the total weight of the siloxane.

Claim 47

Dependent Claim 51 words

The waveguide of claim 33 in which the cladding comprises a blend of two methylphenyl siloxanes of different phenyl content, the refractive index of the two methylphenyl siloxanes being different by no more than 0.02 and the viscosity of both methylphenyl siloxanes being in the range of 500 to 10,000 cps.

Claim 48

Dependent Claim 11 words

The waveguide of claim 33 wherein T 1 is 10° C.

Claim 49

Dependent Claim 11 words

The waveguide of claim 33 wherein T 1 is 5° C.

Claim 50

Dependent Claim 11 words

The waveguide of claim 33 wherein T 1 is 0° C.

Claim 51

Dependent Claim 162 words

A waveguide comprising a fiber core and a cladding disposed on and around the exterior surface of the core, the cladding having a crystalline melting point greater than -20° C., the refractive index of the cladding being less than the refractive index of the core at temperatures greater than the crystalline melting point of the cladding and being greater than or equal to the refractive index of the core at temperatures less than or equal to the crystalline melting point, the cladding comprising a cross-linked polydialkyl siloxane comprising the unit: ##STR2## where each R 1 in a polymer chain is independently selected from the group consisting of methyl, ethyl, and propyl groups; and where each R 2 in a polymer chain is independently an alkyl group of at least 10 carbon atoms and the R 1 's in a polymer chain can be the same or different and the R 2 's in a polymer chain can be the same or different.

Claim 52

Dependent Claim 162 words

A waveguide comprising a fiber core and a cladding disposed on and around the exterior surface of the core, the cladding having a crystalline melting point greater than -20° C., the refractive index of the cladding being less than the refractive index of the core at temperatures greater than the crystalline melting point of the cladding and being greater than or equal to the refractive index of the core at temperatures less than or equal to the crystalline melting point, the cladding comprising a cross-linked polydialkyl siloxane comprising the unit: ##STR2## where each R 1 in a polymer chain is independently selected from the group consisting of methyl, ethyl, and propyl groups; and where each R 2 in a polymer chain is independently an alkyl group of at least 10 carbon atoms and the R 1 's in a polymer chain can be the same or different and the R 2 's in a polymer chain can be the same or different.

Claim 53

Dependent Claim 14 words

The waveguide of claim 40 in which each R 1 is a methyl group.

Claim 54

Dependent Claim 13 words

The waveguide of claim 40 or 41 wherein each R 2 is tetradecane.

Claim 55

Dependent Claim 17 words

The waveguide of claim 40 or 41 wherein a portion of the R 2 's are tetradecane.

Claim 56

Dependent Claim 14 words

The waveguide of claim 40 wherein each R 2 is a linear alkyl group.

Claim 57

Dependent Claim 81 words

A waveguide comprising a solid core and a solid cladding disposed on and around the core, the index of refraction of the cladding being greater than or equal to the index of refraction of the core at temperatures of T 1 and greater, T 1 being greater than about -20° C., and less than about 200° C., the index of refraction of the cladding being less than the index of refraction of the core at temperatures less than T 1 .

Claim 58

Dependent Claim 81 words

A waveguide comprising a solid core and a solid cladding disposed on and around the core, the index of refraction of the cladding being greater than or equal to the index of refraction of the core at temperatures of T 1 and greater, T 1 being greater than about -20° C., and less than about 200° C., the index of refraction of the cladding being less than the index of refraction of the core at temperatures less than T 1 .

Claim 59

Dependent Claim 12 words

The waveguide of claim 45 wherein T 1 is about 0° C.

Claim 60

Dependent Claim 13 words

The waveguide of claim 45 wherein T 1 is greater than 0° C.

Claim 61

Dependent Claim 72 words

A waveguide comprising a solid core and solid cladding disposed thereon, the core having a crystalline melting point greater than -20° C., the refractive index of the core being less than the refractive index of the cladding at temperatures greater than the crystalline melting point of the core and being greater than or equal to the refractive index of the cladding at temperatures less than or equal to the crystalline melting point.

Claim 62

Dependent Claim 72 words

A waveguide comprising a solid core and solid cladding disposed thereon, the core having a crystalline melting point greater than -20° C., the refractive index of the core being less than the refractive index of the cladding at temperatures greater than the crystalline melting point of the core and being greater than or equal to the refractive index of the cladding at temperatures less than or equal to the crystalline melting point.

Claim 63

Dependent Claim 151 words

A waveguide comprising a fiber core and a cladding disposed on and around the exterior surface of the core, the core having a crystalline melting point greater than -20° C., the refractive index of the core being less than the refractive index of the cladding at temperatures greater than the crystalline melting point of the core and being greater than or equal to the refractive index of the cladding at temperatures less than or equal to the crystalline melting point, the core comprising a cross-linked polydialkyl siloxane comprising the unit: ##STR3## where each R 1 in a polymer chain is independently selected from the group consisting of methyl, ethyl, and propyl groups; and where each R 2 in a polymer chain is independently an alkyl group of at least 10 carbon atoms and the R 1 's and R 2 's in a polymer chain can be the same or different.

Claim 64

Dependent Claim 151 words

A waveguide comprising a fiber core and a cladding disposed on and around the exterior surface of the core, the core having a crystalline melting point greater than -20° C., the refractive index of the core being less than the refractive index of the cladding at temperatures greater than the crystalline melting point of the core and being greater than or equal to the refractive index of the cladding at temperatures less than or equal to the crystalline melting point, the core comprising a cross-linked polydialkyl siloxane comprising the unit: ##STR3## where each R 1 in a polymer chain is independently selected from the group consisting of methyl, ethyl, and propyl groups; and where each R 2 in a polymer chain is independently an alkyl group of at least 10 carbon atoms and the R 1 's and R 2 's in a polymer chain can be the same or different.

Claim 65

Dependent Claim 14 words

The waveguide of claim 49 in which each R 1 is a methyl group.

Claim 66

Dependent Claim 11 words

The waveguide of claim 49 wherein each R 2 is tetradecane.

Claim 67

Dependent Claim 15 words

The waveguide of claim 49 wherein a portion of the R 2 's are tetradecane.

Claim 68

Dependent Claim 14 words

The waveguide of claim 49 wherein each R 2 is a linear alkyl group.

Claim 69

Dependent Claim 197 words

A waveguide comprising a core, a first light transmissive cladding disposed on and around the exterior surface of the core, and a second cladding disposed on and around the exterior surface of the first cladding, the refractive index of the first cladding being less than the refractive index of the core at temperatures less than a first temperature, T 1 , and being greater than or equal to the refractive index of the core at temperatures greater than T 1 , the refractive index of the second cladding being less than the refractive index of the first cladding at temperatures less than a second temperature, T 2 , and greater than or equal to the refractive index of the first cladding at temperatures greater than T 2 , T 2 being greater than T 1 , wherein at temperatures less than T 1 the waveguide is capable of transmitting light through the core, and at temperatures less than T 2 and greater than T 1 , the waveguide is capable of transmitting light through the first cladding, and at temperatures greater than T 2 , substantially no light is transmitted through the core and the first cladding.

Claim 70

Dependent Claim 197 words

A waveguide comprising a core, a first light transmissive cladding disposed on and around the exterior surface of the core, and a second cladding disposed on and around the exterior surface of the first cladding, the refractive index of the first cladding being less than the refractive index of the core at temperatures less than a first temperature, T 1 , and being greater than or equal to the refractive index of the core at temperatures greater than T 1 , the refractive index of the second cladding being less than the refractive index of the first cladding at temperatures less than a second temperature, T 2 , and greater than or equal to the refractive index of the first cladding at temperatures greater than T 2 , T 2 being greater than T 1 , wherein at temperatures less than T 1 the waveguide is capable of transmitting light through the core, and at temperatures less than T 2 and greater than T 1 , the waveguide is capable of transmitting light through the first cladding, and at temperatures greater than T 2 , substantially no light is transmitted through the core and the first cladding.

Claim 71

Dependent Claim 21 words

The waveguide of claim 54 wherein the thickness of the first cladding is less than the thickness of the second cladding.

Claim 72

Dependent Claim 70 words

A waveguide comprising a core and cladding disposed thereon, the cladding having a crystalline melting point of about 1° C., the refractive index of the cladding being less than the refractive index of the core at temperatures greater than the crystalline melting point of the cladding and being greater than or equal to the refractive index of the core at temperatures less than or equal to the crystalline melting point.

Claim 73

Dependent Claim 70 words

A waveguide comprising a core and cladding disposed thereon, the cladding having a crystalline melting point of about 1° C., the refractive index of the cladding being less than the refractive index of the core at temperatures greater than the crystalline melting point of the cladding and being greater than or equal to the refractive index of the core at temperatures less than or equal to the crystalline melting point.

Claim 74

Dependent Claim 151 words

A waveguide comprising a fiber core and a cladding disposed on and around the exterior surface of the core, the cladding having a crystalline melting point greater than -20° C., the refractive index of the cladding being less than the refractive index of the core at temperatures greater than the crystalline melting point of the cladding and being greater than or equal to the refractive index of the core at temperatures less than or equal to the crystalline melting point, the cladding comprising a cross-linked polydialkyl siloxane comprising the unit: ##STR4## where each R1 in a polymer chain is independently selected from the group consisting of methyl, ethyl, and propyl groups; and where a portion of the R2's are independently alkyl groups of at least 10 carbon atoms and a portion of the R2's are fluorine substituted groups, wherein the R1's in a polymer chain can be the same or different.

Claim 75

Dependent Claim 151 words

A waveguide comprising a fiber core and a cladding disposed on and around the exterior surface of the core, the cladding having a crystalline melting point greater than -20° C., the refractive index of the cladding being less than the refractive index of the core at temperatures greater than the crystalline melting point of the cladding and being greater than or equal to the refractive index of the core at temperatures less than or equal to the crystalline melting point, the cladding comprising a cross-linked polydialkyl siloxane comprising the unit: ##STR4## where each R1 in a polymer chain is independently selected from the group consisting of methyl, ethyl, and propyl groups; and where a portion of the R2's are independently alkyl groups of at least 10 carbon atoms and a portion of the R2's are fluorine substituted groups, wherein the R1's in a polymer chain can be the same or different.

Claim 76

Dependent Claim 15 words

The waveguide of claim 57 wherein a portion of the R2 groups are tri-fluoro propyl.

Claim 77

Dependent Claim 114 words

A waveguide comprising a fiber core and a cladding disposed on and around the exterior surface of the core, the cladding having a crystalline melting point greater than -20° C., the refractive index of the cladding being less than the refractive index of the core at temperatures greater than the crystalline melting point of the cladding and being greater than or equal to the refractive index of the core at temperatures less than or equal to the crystalline melting point, the cladding comprising a cross-linked polydialkyl siloxane comprising the unit: ##STR5## where a portion of the R's are alkyl groups of at least 10 carbon atoms and a portion of the R's are trifluoropropyl.

Claim 78

Dependent Claim 114 words

A waveguide comprising a fiber core and a cladding disposed on and around the exterior surface of the core, the cladding having a crystalline melting point greater than -20° C., the refractive index of the cladding being less than the refractive index of the core at temperatures greater than the crystalline melting point of the cladding and being greater than or equal to the refractive index of the core at temperatures less than or equal to the crystalline melting point, the cladding comprising a cross-linked polydialkyl siloxane comprising the unit: ##STR5## where a portion of the R's are alkyl groups of at least 10 carbon atoms and a portion of the R's are trifluoropropyl.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1986-02-14	1986-08-16	1987-02-15	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1990-02-14	1990-08-16	1991-02-15	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1994-02-14	1994-08-16	1995-02-15	$7700.00	Window Closed / Lapsed

Thermostatic fiber optic waveguides

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