US4556599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat reflection film
Assignee: Soken Inc
•
Filing: 1984-10-23
•
Granted: 1985-12-03
•
Expires: 2004-10-23
Abstract
Abstract A heat-reflection film comprising: a first layer formed on a base plate, the optical thickness of the first layer being approximately λ/8 or 3λ/8, in which λ is the designed wavelength; a plurality of intermediate layers from a second layer to a (2n+2)th layer, in which n is a positive integral number, the optical thickness of each intermediate layer being λ/4; and an uppermost (2n+3)th layer, the optical thickness of which is approximately λ/8, wherein n g <n 1 <n 2 , in which n g is the refractive index of the base plate, n 1 is the refractive index of the first layer, and n 2 is the refractive index of the second layer, the layers formed above the first layer being arranged in such a manner that high refractive index layers and low refractive index layers are alternately stacked, the second layer being arranged as a high refractive index layer.
Inventors
- 👤 Susumu Sato
- 👤 Tadashi Hattori
- 👤 Yoshiki Ueno
- 👤 Takashi Taguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:54
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/28; G02B5/281; G02B5/282; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
234 words
A heat-reflection film comprising: a first layer formed on a base plate which is transparent for visible rays, the optical thickness of said first layer being approximately λ/8 or 3λ/8, in which λ is a designed wavelength; a plurality of intermediate layers from a second layer to a (2n+2)th layer, in which n is a positive integral number, the optical thickness of each intermediate layer being λ/4; an uppermost (2n+3)th layer, the optical thickness of which is approximately λ/8, wherein n g <n 1 <n 2 , in which n g is the refractive index of said base plate, n 1 is the refractive index of said first layer, and n 2 is the refractive index of said second layer, the layers formed above said first layer being arranged in such a manner that high refractive index layers and low refractive index layers are alternately stacked, said second layer being arranged as a high refractive index layer; said heat-reflection film including said layers and said base plate being constructed and arranged so as to have a reflection ratio for visible rays which is smaller than the reflection ratio for visible rays of said base plate; and said heat-reflection film including said layers and said base plate being constructed and arranged so as to have a reflection ratio for infrared rays which is greater than the reflection ratio for infrared rays of said base plate.
Claim 2
Dependent Claim
234 words
A heat-reflection film comprising: a first layer formed on a base plate which is transparent for visible rays, the optical thickness of said first layer being approximately λ/8 or 3λ/8, in which λ is a designed wavelength; a plurality of intermediate layers from a second layer to a (2n+2)th layer, in which n is a positive integral number, the optical thickness of each intermediate layer being λ/4; an uppermost (2n+3)th layer, the optical thickness of which is approximately λ/8, wherein n g <n 1 <n 2 , in which n g is the refractive index of said base plate, n 1 is the refractive index of said first layer, and n 2 is the refractive index of said second layer, the layers formed above said first layer being arranged in such a manner that high refractive index layers and low refractive index layers are alternately stacked, said second layer being arranged as a high refractive index layer; said heat-reflection film including said layers and said base plate being constructed and arranged so as to have a reflection ratio for visible rays which is smaller than the reflection ratio for visible rays of said base plate; and said heat-reflection film including said layers and said base plate being constructed and arranged so as to have a reflection ratio for infrared rays which is greater than the reflection ratio for infrared rays of said base plate.
Claim 3
Dependent Claim
64 words
A heat-reflection film as set forth in claim 1, in which each of said high refractive index layers is formed from material selected from ZrO 2 , TiO 2 , and CeO 2 and in which each of said low refractive index layers in formed from material selected from MgF 2 , SiO 2 , Na 3 AlF 3 , and CeF 4 .
Claim 4
Dependent Claim
27 words
A heat-reflection film as set forth in claim 1, in which n=2 so that five intermediate layers are stacked between said first layer and said uppermost layer.
Claim 5
Dependent Claim
51 words
A heat-reflection film as set forth in claim 1, in which said first layer is formed from material selected from CeF 3 , Al 2 O 3 , SnO 2 , PbF 3 , NdF 3 , Pr 6 O 11 , and In 2 O 3 and a combination thereof.
Claim 6
Dependent Claim
26 words
A heat-reflection film as set forth in claim 1, in which said first layer is formed from a mixture of ZrO 2 and MgF 2 .
Claim 7
Dependent Claim
21 words
A heat-reflection film as set forth in claim 1, in which said first layer comprises electrically conductive and optically transparent film.
Claim 8
Dependent Claim
32 words
A heat-reflection film as set forth in claim 1, in which the refractive index of said uppermost layer is the same as or less than that of said low refractive index layer.
References Cited (Backward Citations)
US25767A
Cited
US2624823A
Cited
US2698261A
Cited
US2772190A
Cited
US2617741A
Cited
USRE25767E
Cited
US3053698A
Cited
US3356522A
Cited
US3356523A
Cited
US3853386A
Cited
US4070781A
Cited
US4128303A
Cited
US4370027A
Cited
US4286009A
Cited
US4244997A
Cited
US4229066A
Cited
US4461532A
Cited
US4504109A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-02 | 1989-06-03 | 1989-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-02 | 1993-06-03 | 1993-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-02 | 1997-06-03 | 1997-12-03 | $7700.00 | Window Closed / Lapsed |