US3957675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultraviolet light reflective coating
Assignee: National Aeronautics and Space Administration
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Filing: 1973-09-28
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Granted: 1976-05-18
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Expires: 1993-09-28
Abstract
Abstract An ultraviolet light reflective coating is disclosed which exhibits high reflectance to ultraviolet light having wavelengths down to about 2,000 Angstrom units. The coating composition comprises a dispersion of barium sulphate in an aqueous solution of a water-soluble inorganic binder selected from the group consisting of alkali metal sulphates, ammonium sulphate and mixtures thereof. The coating is preferably employed in conjunction with an alkaline primer.
Inventors
- 👤 John B. Schutt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:34
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/08; G02B5/0891
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
107 words
A coating composition comprising a dispersion of barium sulphate in an aqueous solution of a water-soluble inorganic binder selected from the group consisting of alkali metal sulphates, ammonium sulphate and mixtures thereof, said coating composition containing from about 30.6 to about 39.8 percent by weight of barium sulphate and from about 55.6 to about 64.4 percent by weight of water, the balance of the composition consisting of from about 0.005 to about 11.8 percent by weight of the water-soluble inorganic binder, said composition after evaporation of the vaporizable components form a layer thereof exhibiting high reflectance to ultraviolet light having wavelengths down to about 2,000 Angstrum units.
Claim 2
Dependent Claim
107 words
A coating composition comprising a dispersion of barium sulphate in an aqueous solution of a water-soluble inorganic binder selected from the group consisting of alkali metal sulphates, ammonium sulphate and mixtures thereof, said coating composition containing from about 30.6 to about 39.8 percent by weight of barium sulphate and from about 55.6 to about 64.4 percent by weight of water, the balance of the composition consisting of from about 0.005 to about 11.8 percent by weight of the water-soluble inorganic binder, said composition after evaporation of the vaporizable components form a layer thereof exhibiting high reflectance to ultraviolet light having wavelengths down to about 2,000 Angstrum units.
Claim 3
Dependent Claim
22 words
The coating composition of claim 1 wherein said aqueous solution of said binder is a saturated solution of an alkali metal sulphate.
Claim 4
Dependent Claim
14 words
The coating composition of claim 2 wherein said alkali metal sulphate is potassium sulphate.
Claim 5
Dependent Claim
12 words
The coating composition of claim 1 wherein said binder is potassium sulphate.
Claim 6
Dependent Claim
12 words
The coating composition of claim 1 wherein said binder is ammonium sulphate.
Claim 7
Dependent Claim
19 words
The coating composition of claim 5 wherein the weight ratio of ammonium sulphate to barium sulphate is about 1:6.
Claim 8
Dependent Claim
18 words
The coating composition of claim 1 wherein the binder is a mixture of potassium sulphate and ammonium sulphate.
References Cited (Backward Citations)
US3512895A
Cited
US3654164A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-18 | 1979-11-17 | 1980-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-18 | 1983-11-17 | 1984-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-18 | 1987-11-17 | 1988-05-18 | $7700.00 | Window Closed / Lapsed |