US4187336A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-iridescent glass structures
Assignee: Individual
•
Filing: 1977-04-04
•
Granted: 1980-02-05
•
Expires: 1997-04-04
Abstract
Abstract This disclosure describes transparent glass window structures of the type bearing a first coating of infra-red reflective material which is advantageously less than about 0.85 microns in thickness and wherein the observance of iridescence resulting from such a first coating is markedly reduced by provision of a second coating arranged in register with said first coating, the second coating providing at least two interfaces which, with the mass of the second coating, form means to reflect and refract light therefrom to interfere with the observation of iridescence. The invention also encompasses processes for providing such windows. A particular advantage of the invention is its efficacy with clear and lightly tinted glasses wherein the problem of iridescent color has had its greatest commercial impact.
Inventors
- 👤 Roy G. Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:13
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/208; C; C03; C03C; C03C17/00; C03C17/001; C03C17/002; C03C17/34; C03C17/3411; C03C17/3417; G02B5/28; G02B5/281; G02B5/282; C03C2218/00; C03C2218/30; C03C2218/36; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/261; Y10T428/263; Y10T428/264; Y10T428/265
Claims Analysis
Total Claims: 108
Claim 1
Independent Claim
158 words
In a structure formed of at least one transparent glass sheet and comprising thereon a first inorganic coating of an infra-red reflective material which material is of the type that is a transparent semiconductor and normally exhibits iridescent colors in daylight illumination, the improvement wherein a second coating, is between said glass and said first coating, and said second coating forms means to substantially diminish iridescent colors of said first coating by providing at least two interfaces which form means, together with the mass of said second coating, to reflect and refract light such that the observability, in daylight illumination, of said iridescent colors is substantially reduced; and wherein said second coating has a refractive index defined as about the square root of the multiple of the refractive indices of said glass and said first coating, and wherein said second coating has a thickness of about 1/4 wavelength of light having a vacuum wavelength of about 500 nanometers.
Claim 2
Dependent Claim
158 words
In a structure formed of at least one transparent glass sheet and comprising thereon a first inorganic coating of an infra-red reflective material which material is of the type that is a transparent semiconductor and normally exhibits iridescent colors in daylight illumination, the improvement wherein a second coating, is between said glass and said first coating, and said second coating forms means to substantially diminish iridescent colors of said first coating by providing at least two interfaces which form means, together with the mass of said second coating, to reflect and refract light such that the observability, in daylight illumination, of said iridescent colors is substantially reduced; and wherein said second coating has a refractive index defined as about the square root of the multiple of the refractive indices of said glass and said first coating, and wherein said second coating has a thickness of about 1/4 wavelength of light having a vacuum wavelength of about 500 nanometers.
Claim 3
Dependent Claim
18 words
A structure as defined in claim 1 wherein said semiconductor layer is less than 0.4 microns in thickness.
Claim 4
Dependent Claim
58 words
A structure as defined in claim 2 wherein said structure comprises only glass sheets which are formed of clear glass or glass of light tint, said structure being free from metallic, gray or bronze and other dark toned tones capable of suppressing the visibility of iridescence and reducing the transmittance of the structures to less than about 25%.
Claim 5
Dependent Claim
22 words
A structure as defined in claim 1 wherein said first and second coatings together are from 0.1 to 1 micron in thickness.
Claim 6
Dependent Claim
58 words
A structure as defined in claim 4, wherein said structure comprises only glass sheets which are formed of clear glass or glass of light tint, said structure being free from metallic gray or bronze and other dark toned tones capable of suppressing the visibility of iridescence and reducing the transmittance of the structures to less than about 25%.
Claim 7
Dependent Claim
14 words
A structure as defined in claim 1 exhibiting a color saturation value below 5.
Claim 8
Dependent Claim
22 words
A structure as defined in claim 6 wherein said first and second coatings together are from 0.1 to 1 micron in thickness.
Claim 9
Dependent Claim
58 words
A structure as defined in claim 6 wherein said structure comprises only glass sheets which are formed of clear glass or glass of light tint, said structure being free from metallic, gray or bronze and other dark toned tones capable of suppressing the visibility of iridescence and reducing the transmittance of the structures to less than about 25%.
Claim 10
Dependent Claim
14 words
A structure as defined in claim 1 exhibiting a color saturation value below 8.
Claim 11
Dependent Claim
58 words
A structure as defined in claim 9 wherein said structure comprises only glass sheets which are formed of clear glass or glass of light tint, said structure being free from metallic, gray or bronze and other dark toned tones capable of suppressing the visibility of iridescence and reducing the transmittance of the structures to less than about 25%.
Claim 12
Dependent Claim
22 words
A structure as defined in claim 9 wherein said first and second coatings together are from 0.1 to 1 micron in thickness.
Claim 13
Dependent Claim
18 words
A structure as defined in claim 9 wherein said semiconductor layer is less than 0.4 micron in thickness.
Claim 14
Dependent Claim
14 words
A structure as defined in claim 1 exhibiting a color saturation value below 13.
Claim 15
Dependent Claim
22 words
A structure as defined in claim 13 wherein said first and second coatings together are from 0.1 to 1 micron in thickness.
Claim 16
Dependent Claim
18 words
A structure as defined in claim 13 wherein said semiconductor layer is less than 0.4 micron in thickness.
Claim 17
Dependent Claim
58 words
A structure as defined in claim 13 wherein said structure comprises only glass sheets which are formed of clear glass or glass of light tint, said structure being free from metallic, gray or bronze and other dark toned tones capable of suppressing the visibility of iridescence and reducing the transmittance of the structures to less than about 25%.
Claim 18
Dependent Claim
14 words
A structure as defined in claim 1 wherein said first coating is stannic oxide.
Claim 19
Dependent Claim
18 words
A structure as defined in claim 17 wherein said semiconductor layer is less than 0.4 micron in thickness.
Claim 20
Dependent Claim
22 words
A structure as defined in claim 17 wherein said first and second coatings together are from 0.1 to 1 micron in thickness.
Claim 21
Dependent Claim
58 words
A structure as defined in claim 17 wherein said structure comprises only glass sheets which are formed of clear glass or glass of light tint, said structure being free from metallic, gray or bronze and other dark toned tones capable of suppressing the visibility of iridescence and reducing the transmittance of the structures to less than about 25%.
Claim 22
Dependent Claim
30 words
A structure as defined in claim 1 wherein said second coating is an amorphous material and forms means to avoid haze-formation on said glass during application of said first coating.
Claim 23
Dependent Claim
15 words
A structure as defined in claim 21 wherein said color saturation value is below 8.
Claim 24
Dependent Claim
15 words
A structure as defined in claim 21 wherein said color saturation value is below 13.
Claim 25
Dependent Claim
22 words
A structure as defined in claim 21 wherein said first and second coatings together are from 0.1 to 1 micron in thickness.
Claim 26
Dependent Claim
58 words
A structure as defined in claim 21 wherein said structure comprises only glass sheets which are formed of clear glass or glass of light tint, said structure being free from metallic, gray or bronze and other dark toned tones capable of suppressing the visibility of iridescence and reducing the transmittance of the structures to less than about 25%.
Claim 27
Dependent Claim
18 words
A structure as defined in claim 21 wherein said semiconductor layer is less than 0.4 micron in thickness.
Claim 28
Dependent Claim
51 words
A structure as defined in claim 1 wherein said second coating has a refractive index of from about 1.7 to 1.8 and is about 64 to 80 nanometers thick, and wherein said first coating has a refractive index of about 2, and said glass has a refractive index of about 1.5.
Claim 29
Dependent Claim
15 words
A structure as defined in claim 27 wherein said color saturation value is below 8.
Claim 30
Dependent Claim
18 words
A structure as defined in claim 27 wherein said semiconductor layer is less than 0.4 micron in thickness.
Claim 31
Dependent Claim
45 words
A structure as defined in claim 29 wherein said structure comprises only transparent sheeting which is formed of clear glass or glass of light tint, said structure being free from metallic, gray or bronze and other dark-toned tones capable of suppressing the visibility of iridescene.
Claim 32
Dependent Claim
22 words
A structure as defined in claim 27 wherein said first and second coatings together are from 0.1 to 1 micron in thickness.
Claim 33
Dependent Claim
17 words
A structure as defined in claim 27 wherein said second coating is principally formed of aluminum oxide.
Claim 34
Dependent Claim
18 words
A structure as defined in claim 32 wherein said semiconductor layer is less than 0.4 micron in thickness.
Claim 35
Dependent Claim
45 words
A structure as defined in claim 32 wherein said structure comprises only transparent sheeting which is formed of clear glass or glass of light tint, said structure being free from metallic, gray or bronze and other dark-toned tones capable of suppressing the visibility of iridescence.
Claim 36
Dependent Claim
21 words
The structure of claim 27 in which said second coating is formed from metal oxide, metal nitride, or a mixture thereof.
Claim 37
Dependent Claim
18 words
A structure as defined in claim 35 wherein said semiconductor layer is less than 0.4 micron in thickness.
Claim 38
Dependent Claim
45 words
A structure as defined in claim 35 wherein said structure comprises only transparent sheeting which is formed of clear glass or glass of light tint, said structure being free from metallic, gray or bronze and other dark-toned tones capable of suppressing the visibility of iridescence.
Claim 39
Dependent Claim
26 words
A structure as defined in claim 35 in which the metal oxide and nitride compositions are selected from those disclosed in Table A of the Specification.
Claim 40
Dependent Claim
15 words
A structure as defined in claim 38 wherein said color saturation value is below 13.
Claim 41
Dependent Claim
15 words
A structure as defined in claim 38 wherein said color saturation value is below 8.
Claim 42
Dependent Claim
30 words
A structure as defined in claim 27 wherein said second coating is an amorphous material and forms means to avoid haze-formation on said glass during application of said first coating.
Claim 43
Dependent Claim
18 words
A structure as defined in claim 41 wherein said semiconductor layer is less than 0.4 micron in thickness.
Claim 44
Dependent Claim
12 words
A structure of claim 41 wherein said amorphous film is silicon oxynitride.
Claim 45
Dependent Claim
15 words
A structure as defined in claim 43 wherein said color saturation value is below 13.
Claim 46
Dependent Claim
15 words
A structure as defined in claim 43 wherein said color saturation value is below 8.
Claim 47
Dependent Claim
45 words
A structure as defined in claim 41 wherein said structure comprises only transparent sheeting which is formed of clear glass or glass of light tint, said structure being free from metallic, gray or bronze and other dark-toned tones capable of suppressing the visibility of iridescence.
Claim 48
Dependent Claim
22 words
A structure as defined in claim 41 wherein said first and second coatings together are from 0.1 to 1 micron in thickness.
Claim 49
Dependent Claim
16 words
A structure as defined in claim 27 wherein said first coating is fluorine doped stannic oxide.
Claim 50
Dependent Claim
22 words
A structure as defined in claim 48 wherein said first and second coatings together are from 0.1 to 1 micron in thickness.
Claim 51
Dependent Claim
15 words
A structure as defined in claim 48 wherein said color saturation value is below 13.
Claim 52
Dependent Claim
18 words
A structure as defined in claim 48 wherein said semiconductor layer is less than 0.4 micron in thickness.
Claim 53
Dependent Claim
45 words
A structure as defined in claim 48 wherein said structure comprises only transparent sheeting which is formed of clear glass or glass of light tint, said structure being free from metallic, gray or bronze and other dark-toned tones capable of suppressing the visibility of iridescence.
Claim 54
Dependent Claim
15 words
A structure as defined in claim 48 wherein said color saturation value is below 8.
Claim 55
Dependent Claim
15 words
A structure as defined in claim 27 wherein said color saturation value is below 13.
Claim 56
Dependent Claim
57 words
A structure as defined in claim 1 wherein said structure comprises only glass sheets which are formed of clear glass or glass of light tint, said structure being free from metallic, gray or bronze and other dark-toned tones capable of suppressing the visibility of iridescence and reducing the transmittance of the structures to less than about 25%.
Claim 57
Dependent Claim
165 words
In a structure formed of at least one transparent glass sheet and comprising thereon a first inorganic coating of an infra-red reflective material which material is of the type that is a transparent semiconductor and normally exhibits iridescent colors in daylight illumination, the improvement wherein a second coating, is between said glass and said first coating, and said second coating forms means to substantially diminish iridescent colors of said first coating by providing at least two additional interfaces which form means, together with the mass of said second coating, to reflect and refract light such that the observability, in daylight illumination, of said iridescent colors is substantially reduced; and wherein said second coating has a composite refractive index defined as about the square root of the multiple of the refractive indices of said glass and said first coating, and wherein second coating is comprised of 2 layers each having a thickness of about 1/4 wavelength of light having a vacuum wavelength of about 500 nanometers.
Claim 58
Dependent Claim
165 words
In a structure formed of at least one transparent glass sheet and comprising thereon a first inorganic coating of an infra-red reflective material which material is of the type that is a transparent semiconductor and normally exhibits iridescent colors in daylight illumination, the improvement wherein a second coating, is between said glass and said first coating, and said second coating forms means to substantially diminish iridescent colors of said first coating by providing at least two additional interfaces which form means, together with the mass of said second coating, to reflect and refract light such that the observability, in daylight illumination, of said iridescent colors is substantially reduced; and wherein said second coating has a composite refractive index defined as about the square root of the multiple of the refractive indices of said glass and said first coating, and wherein second coating is comprised of 2 layers each having a thickness of about 1/4 wavelength of light having a vacuum wavelength of about 500 nanometers.
Claim 59
Dependent Claim
45 words
A structure as defined in claim 56 wherein said structure comprises only transparent sheeting which are formed of clear glass or glass of light tint, said structure being free from metallic, gray or bronze and other dark-toned tones capable of suppressing the visibility of iridescence.
Claim 60
Dependent Claim
15 words
The structure of claim 56 wherein said film closer to said glass is silicon oxynitride.
Claim 61
Dependent Claim
14 words
A structure as defined in claim 50 wherein said first coating is stannic oxide.
Claim 62
Dependent Claim
23 words
A structure as defined in claim 56 wherein all said inorganic coatings on said glass total from 0.1 to 1.0 micron in thickness.
Claim 63
Dependent Claim
51 words
A structure as defined in claim 56 wherein said second coating comprises two layers including (a) one film closer to the glass and having a composition disclosed in Table B; and (b) a second film closer to said first coating and having a composition disclosed in Table C of the Specification.
Claim 64
Dependent Claim
18 words
A structure as defined in claim 56 wherein the structure comprises an amorphous layer immediately over said glass.
Claim 65
Dependent Claim
81 words
A structure as defined in claim 56 wherein said second coating comprises two layers including (a) one film closer to the glass and having a refractive index about that given by the formula n.sub.a =n.sub.sc.sup.0.26 n.sub.gl.sup.0.74 and (b) a second film closer to said first coating and having a refractive index about that given by the formula n.sub.b =n.sub.sc.sup.0.74 n.sub.gl.sup.0.26 wherein n sc is the refractive index of said first coating and n gl is the refractive index of the glass.
Claim 66
Dependent Claim
45 words
A structure as defined in claim 63 wherein said structure comprises only transparent sheeting which are formed of clear glass or glass of light tint, said structure being free from metallic, gray or bronze and other dark-toned tones capable of suppressing the visibility of iridescence.
Claim 67
Dependent Claim
15 words
The structure of claim 63 wherein said film closer to said glass is silicon oxynitride.
Claim 68
Dependent Claim
19 words
A structure as defined in any of claim 65 wherein said Color Index value is less than about 8.
Claim 69
Dependent Claim
18 words
A structure as defined in claim 63 wherein the structure comprises an amorphous layer immediately over said glass.
Claim 70
Dependent Claim
51 words
A structure as defined in claim 63 wherein said second coating comprises two layers including (a) one film closer to the glass and having a composition disclosed in Table B; and (b) a second film closer to said first coating and having a composition disclosed in Table C of the Specification.
Claim 71
Dependent Claim
14 words
A structure as defined in claim 63 wherein said first coating is stannic oxide.
Claim 72
Dependent Claim
81 words
A structure as defined in claim 63 wherein said second coating is comprised of two layers including (a) one layer, closer to the glass and having a refractive index in a range of about 1.6 to 1.7; (b) a second layer, closer to the first coating and having a refractive index in a range of about 1.8 to 1.9, and wherein said first coating has a refractive index of about 2, and said glass has a refractive index of about 1.5.
Claim 73
Dependent Claim
14 words
A structure as defined in claim 70 wherein said first coating is stannic oxide.
Claim 74
Dependent Claim
45 words
A structure as defined in claim 70 wherein said structure comprises only transparent sheeting which are formed of clear glass or glass of light tint, said structure being free from metallic, gray or bronze and other dark-toned tones capable of suppressing the visibility of iridescence.
Claim 75
Dependent Claim
51 words
A structure as defined in claim 70 wherein said second coating comprises two layers including (a) one film closer to the glass and having a composition disclosed in Table B; and (b) a second film closer to said first coating and having a composition disclosed in Table C of the Specification.
Claim 76
Dependent Claim
18 words
A structure as defined in claim 70 wherein the structure comprises an amorphous layer immediately over said glass.
Claim 77
Dependent Claim
15 words
The structure of claim 70 wherein said film closer to said glass is silicon oxynitride.
Claim 78
Dependent Claim
146 words
In a structure formed of at least one transparent glass sheet and comprising thereon a first inorganic coating of an infra-red reflective material which material is of the type that is a transparent semiconductor and normally exhibits iridescent colors in daylight illumination, the improvement wherein a second coating, is between said glass and said first coating, and said second coating forms means to substantially diminish iridescent colors of said first coating by providing means, together with the mass of said second coating, to reflect and refract light such that the observability, in daylight illumination, of said iridescent colors is substantially reduced; and wherein said second coating forms a gradient, with respect to refractive index, gradually increasing between said glass and said infra-red reflecting material, from a refractive index closer to that of said glass to a refractive index closer to that of said infra-red reflective material.
Claim 79
Dependent Claim
146 words
In a structure formed of at least one transparent glass sheet and comprising thereon a first inorganic coating of an infra-red reflective material which material is of the type that is a transparent semiconductor and normally exhibits iridescent colors in daylight illumination, the improvement wherein a second coating, is between said glass and said first coating, and said second coating forms means to substantially diminish iridescent colors of said first coating by providing means, together with the mass of said second coating, to reflect and refract light such that the observability, in daylight illumination, of said iridescent colors is substantially reduced; and wherein said second coating forms a gradient, with respect to refractive index, gradually increasing between said glass and said infra-red reflecting material, from a refractive index closer to that of said glass to a refractive index closer to that of said infra-red reflective material.
Claim 80
Dependent Claim
45 words
A structure as defined in claim 76 wherein said structure comprises only transparent sheeting which is formed of clear glass or glass of light tint, said structure being free from metallic, gray or bronze and other dark-toned tones capable of suppressing the visibility of iridescence.
Claim 81
Dependent Claim
42 words
A structure as defined in claim 76, wherein said second coating comprises silicon oxynitride mixture of XSiO 2 (1-X)Si 3 N 4 where X changes from near unity at the glass surface to near zero at the boundary of said first coating.
Claim 82
Dependent Claim
35 words
A structure as defined in claim 78 wherein said Color Index value is below about 13, wherein said coatings are from about 0.1 to 1 micron thick, and wherein said first coating is tin oxide.
Claim 83
Dependent Claim
19 words
A structure as defined in any of claim 78 wherein said Color Index value is less than about 8.
Claim 84
Dependent Claim
58 words
A structure as defined in claim 78 wherein said structure comprises only glass sheets which are formed of clear glass or glass of light tint, said structure being free from metallic, gray or bronze and other dark toned tones capable of suppressing the visibility of iridescence and reducing the transmittance of the structures to less than about 25%.
Claim 85
Dependent Claim
19 words
A structure as defined in claim 78 wherein said Color Index value for said structure is below about 13.
Claim 86
Dependent Claim
45 words
A structure as defined in claim 78 wherein said structure comprises only transparent sheeting which is formed of clear glass or glass of light tint, said structure being free from metallic, gray or bronze and other dark-toned tones capable of suppressing the visibility of iridescence.
Claim 87
Dependent Claim
19 words
A structure as defined in any of claim 76 wherein said Color Index value is less than about 8.
Claim 88
Dependent Claim
35 words
A structure as defined in claim 76 wherein said Color Index value is below about 13, wherein said coatings are from about 0.1 to 1 micron thick, and wherein said first coating is tin oxide.
Claim 89
Dependent Claim
19 words
A structure as defined in claim 76 wherein said Color Index value for said structure is below about 13.
Claim 90
Dependent Claim
22 words
A structure as defined in claim 76 wherein said gradient is stepwise with a plurality of coating increments of different refractive indices.
Claim 91
Dependent Claim
58 words
A structure as defined in claim 87 wherein said structure comprises only glass sheets which are formed of clear glass or glass of light tint, said structure being free from metallic, gray or bronze and other dark toned tones capable of suppressing the visibility of iridescence and reducing the transmittance of the structures to less than about 25%.
Claim 92
Dependent Claim
45 words
A structure as defined in claim 87 wherein said structure comprises only transparent sheeting which is formed of clear glass or glass of light tint, said structure being free from metallic, gray or bronze and other dark-toned tones capable of suppressing the visibility of iridescence.
Claim 93
Dependent Claim
19 words
A structure as defined in claim 87 wherein said Color Index value for said structure is below about 13
Claim 94
Dependent Claim
47 words
A structure as defined in claim 76, wherein said second coating comprises mixtures of Si x Sn 1-x O 2 or Ge x Sn 1-x O 2 , where x ranges from near unity at the glass surface, to zero at the boundary of said first coating.
Claim 95
Dependent Claim
19 words
A structure as defined in any of claim 91 wherein said Color Index value is less than about 8.
Claim 96
Dependent Claim
45 words
A structure as defined in claim 91 wherein said structure comprises only transparent sheeting which is formed of clear glass or glass of light tint, said structure being free from metallic, gray or bronze and other dark-toned tones capable of suppressing the visibility of iridescence.
Claim 97
Dependent Claim
58 words
A structure as defined in claim 91 wherein said structure comprises only glass sheets which are formed of clear glass or glass of light tint, said structure being free from metallic, gray or bronze and other dark toned tones capable of suppressing the visibility of iridescence and reducing the transmittance of the structures to less than about 25%.
Claim 98
Dependent Claim
19 words
A structure as defined in claim 91 wherein said Color Index value for said structure is below about 13.
Claim 99
Dependent Claim
35 words
A structure as defined in claim 91 wherein said Color Index value is below about 13, wherein said coatings are from about 0.1 to 1 micron thick, and wherein said first coating is tin oxide.
Claim 100
Dependent Claim
18 words
A structure as defined in claim 76 wherein said semiconductor layer is less than 0.4 micron in thickness.
Claim 101
Dependent Claim
45 words
A structure as defined in claim 97 wherein said structure comprises only transparent sheeting which is formed of clear glass or glass of light tint, said structure being free from metallic, gray or bronze and other dark-toned tones capable of suppressing the visibility of iridescence.
Claim 102
Dependent Claim
58 words
A structure as defined in claim 97 wherein said structure comprises only glass sheets which are formed of clear glass or glass of light tint, said structure being free from metallic, gray or bronze and other dark toned tones capable of suppressing the visibility of iridescence and reducing the transmittance of the structures to less than about 25%.
Claim 103
Dependent Claim
19 words
A structure as defined in claim 97 wherein said Color Index value for said structure is below about 13.
Claim 104
Dependent Claim
19 words
A structure as defined in any of claim 99 wherein said Color Index value is less than about 8.
Claim 105
Dependent Claim
114 words
A structure formed of at least one transparent glass sheet and comprising thereon a first inorganic coating of an infra-red reflective material which material is of the type that is a transparent semiconductor and normally exhibits iridescent colors in daylight illumination, a second coating, also of the type that normally exhibits iridescent color in daylight illumination, on a transparent sheet but is spaced from said second coating wherein one of said coatings differs from the other of said coatings, in thickness, by about 1/4 wavelength of 500 nanometer light, such that, together, said coatings form means to reflect and refract light which adds incoherently and markedly reduces the perceptibility of iridescence of said structure.
Claim 106
Dependent Claim
114 words
A structure formed of at least one transparent glass sheet and comprising thereon a first inorganic coating of an infra-red reflective material which material is of the type that is a transparent semiconductor and normally exhibits iridescent colors in daylight illumination, a second coating, also of the type that normally exhibits iridescent color in daylight illumination, on a transparent sheet but is spaced from said second coating wherein one of said coatings differs from the other of said coatings, in thickness, by about 1/4 wavelength of 500 nanometer light, such that, together, said coatings form means to reflect and refract light which adds incoherently and markedly reduces the perceptibility of iridescence of said structure.
Claim 107
Dependent Claim
25 words
A structure as defined in claim 102 wherein said first and second coatings are on separate glass plates mounted in a double glazed window structure.
Claim 108
Dependent Claim
35 words
A structure as defined in claim 102 wherein one said coating is about 0.26 microns thick and another of said coatings is about 0.33 microns thick, both coatings having a refractive index of about 2.
References Cited (Backward Citations)
US2617741A
Cited
US3706485A
Cited
US3710074A
Cited
US3885855A
Cited
US3889026A
Cited
US3962062A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-02-04 | 1983-08-06 | 1984-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-04 | 1987-08-06 | 1988-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-04 | 1991-08-06 | 1992-02-05 | $7700.00 | Window Closed / Lapsed |