Patent US4011874A successfully refreshed from Google Patents.
US4011874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dorno ray transmitting sheet
Assignee: Kureha Corp
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Filing: 1974-06-17
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Granted: 1977-03-15
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Expires: 1994-06-17
Abstract
Abstract A melt-molded polyvinylidene fluoride or polymonochlorotrifluoroethylene sheet having a thickness of about 20 mu to 2 mm and a spherulite size of less than about 10 mu , whereby the sheet transmits more than about 40% of the dorno rays in a wavelength region of about 2,800 to 3,300 A, and a sun room using as a light admitting plate a sheet or plate of the polyvinylidene fluoride or the polymonochlorotrifluoroethylene permitting transmission of the physiologically active rays in sunlight.
Inventors
- 👤 Masahiro Segawa
- 👤 Mitsuo Onozuka
- 👤 Ichiroh Ishibashi
- 👤 Shinsuke Yoshikawa
- 👤 Shigeru Saitoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:28
CPC Classifications
A; A61; A61N; A61N5/00; A61N5/06; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10S428/918; Y10T; Y10T428/00; Y10T428/26; Y10T428/268; Y10T428/269; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
83 words
A melt-molded polyvinylidene fluoride or polymonochlorotrifluoroethylene sheet having a thickness of about 20 μ to 2 mm and a spherulite size of between about 0.1 to 10 μ, whereby the sheet transmits between about 40% and about 80% of the dorno rays in a wavelength region of about 2,800 to 3,300A; said sheet having been formed by stretching in at least one axial direction a sheet formed from polyvinylidene fluoride or polymonochlorotrifluoroethylene resin having an inherent viscosity ranging from about 0.8 to 1.8.
Claim 2
Dependent Claim
83 words
A melt-molded polyvinylidene fluoride or polymonochlorotrifluoroethylene sheet having a thickness of about 20 μ to 2 mm and a spherulite size of between about 0.1 to 10 μ, whereby the sheet transmits between about 40% and about 80% of the dorno rays in a wavelength region of about 2,800 to 3,300A; said sheet having been formed by stretching in at least one axial direction a sheet formed from polyvinylidene fluoride or polymonochlorotrifluoroethylene resin having an inherent viscosity ranging from about 0.8 to 1.8.
Claim 3
Dependent Claim
16 words
The sheet of claim 1, wherein the spherulite size range is between 0.1 and 1 μ.
Claim 4
Dependent Claim
72 words
The sheet of claim 1, wherein said sheet comprises a melt-extruded sheet extruded at a temperature ranging from about 180° to 250° C followed by the cooling of the sheet to a temperature ranging from about 10° C to 50° C to permit spherulite growth to a size about 10 to 100 μ and subsequently heating at a temperature of about 80° to 180° C while at least uniaxially stretching the sheet.
Claim 5
Dependent Claim
105 words
A sun-room containing at least one light-admitting plate for admitting physiologically active rays in sunlight, said light-admitting plate comprising a plate of melt-molded polyvinylidene fluoride or polymonochlorotrifluoroethylene plate having a thickness of about 20 μ to 2 mm and a spherulite size of between about 0.1 to 10 μ, whereby the plate transmits between about 40% and about 80% of the dorno rays in a wavelength region of about 2,800 to 3,300 A; said plate having been formed by stretching in at least one axial direction a plate formed from polyvinylidene fluoride or polymonochlorotrifluoroethylene resin having an inherent viscosity ranging from about 0.8 to 1.8.
Claim 6
Dependent Claim
105 words
A sun-room containing at least one light-admitting plate for admitting physiologically active rays in sunlight, said light-admitting plate comprising a plate of melt-molded polyvinylidene fluoride or polymonochlorotrifluoroethylene plate having a thickness of about 20 μ to 2 mm and a spherulite size of between about 0.1 to 10 μ, whereby the plate transmits between about 40% and about 80% of the dorno rays in a wavelength region of about 2,800 to 3,300 A; said plate having been formed by stretching in at least one axial direction a plate formed from polyvinylidene fluoride or polymonochlorotrifluoroethylene resin having an inherent viscosity ranging from about 0.8 to 1.8.
Claim 7
Dependent Claim
12 words
The sheet of claim 1, wherein said sheet has been biaxially stretched.
References Cited (Backward Citations)
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US2954349A
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US3081208A
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US3379606A
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US3850900A
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US3812342A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-14 | 1980-09-13 | 1981-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-14 | 1984-09-13 | 1985-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-14 | 1988-09-13 | 1989-03-15 | $7700.00 | Window Closed / Lapsed |