US3779788A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmitting and reflecting diffuser
Assignee: National Aeronautics and Space Administration
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Filing: 1972-03-30
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Granted: 1973-12-18
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Expires: 1992-03-30
Abstract
Abstract An ultraviolet grade fused silica substrate is coated with vaporized fused silica. The coating thickness is controlled, one thickness causing ultraviolet light to diffuse and another thickness causing ultraviolet light to reflect a near Lambertian pattern.
Inventors
- 👤 L Keafer
- 👤 E Burcher
- 👤 L Kopia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:30
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/22; C03; C03C; C03C17/00; C03C17/22; C03C17/23; C03C17/245; C23C14/06; C23C14/10; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/213; C03C2218/00; C03C2218/10; C03C2218/15; C03C2218/151
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
32 words
The method of claim 1 including the additional step of hardening the deposited material by heat treatment until the surface is slightly glassy, such heat treatment increasing the durability of the coating.
Claim 2
Dependent Claim
34 words
The method of claim 1 whereby the step of vaporizing includes translating heating means along the fused silica material at such a rate that the vaporized material will be condensed evenly upon the substrate.
Claim 3
Dependent Claim
93 words
The method of claim 1 including the steps of adapting said substrate to a holding mechanism; attaching the holding mechanism to rotational means; rotating the substrate; locating the axis of rotation perpendicular to the substrate surface; and wherein the step of vaporizing ultraviolet grade fused silica material includes positioning said material parallel to and at a fixed distance from the substrate surface to be coated; translating heating means along the length of the fused silica material; and the step of depositing of the vaporized material includes producing a coating thickness of 20 mircons.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |