US3675477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Testing method and device using filtered ultra violet radiation
Assignee: Avco Corp
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Filing: 1970-10-29
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Granted: 1972-07-11
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Expires: 1990-10-29
Abstract
Abstract This invention relates in general to an improved and efficient technique for providing ultra violet radiation and particularly to an apparatus which incorporates this ultra violet radiation as a source for testing color fastness or fading characteristics of various materials simulating the suns''s properties. The ultra violet radiation is limited to a narrow effective region by the use of specially selected liquid and glass filters spaced from the light source.
Inventors
- 👤 Richard A Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:50
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/22; G02B5/24; G01; G01N; G01N17/00; G01N17/004; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/33
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
105 words
The method of fading material by selected ultraviolet radiation which comprises the steps of: a. Generating light including ultraviolet radiation; b. Passing said light through a filter system including a solid and liquid to provide radiation of greater than about 3,000A. and less than about 4,000A., said liquid being an aqueous solution including CoSO4 and CuSO4; c. Removing heat from the system by circulating said liquid through a heat exchanger; and d. Positioning the sample to be treated close to the said filtering system, said filtering system being spaced away from the source of said ultraviolet radiation and disposed intermediate said source and said sample.
Claim 2
Independent Claim
105 words
The method of fading material by selected ultraviolet radiation which comprises the steps of: a. Generating light including ultraviolet radiation; b. Passing said light through a filter system including a solid and liquid to provide radiation of greater than about 3,000A. and less than about 4,000A., said liquid being an aqueous solution including CoSO4 and CuSO4; c. Removing heat from the system by circulating said liquid through a heat exchanger; and d. Positioning the sample to be treated close to the said filtering system, said filtering system being spaced away from the source of said ultraviolet radiation and disposed intermediate said source and said sample.
Claim 3
Dependent Claim
28 words
The method of fading material in accordance with claim 1 in which the aqueous solution comprises 1 gram CuSO4.5H2O and 2.5 grams CoSO4.7H2O per 10 cc of water.
Claim 4
Dependent Claim
30 words
The method of fading material in accordance with claim 1 in which the solid filter is comminuted and said aqueous solution is flowed over, around, and between said comminuted filter.
Claim 5
Dependent Claim
195 words
In an apparatus for testing the color-fastness of a sample the combination comprising; a. means for providing a source of ultra violet radiation; b. Container means adapted to receive said ultra violet radiation and disposed adjacent and spaced away from said source, said container means comprising a first wall which is exposed to said source and a second wall, said walls being substantially transparent to ultra violet radiation; c. Filtering means including solid filtering means and liquid filtering means intermediate and substantially filling the spaces between said first and second walls, said liquid comprising an aqueouS solution of CoSO4 and CuSO4, said liquid and solid filter limiting the ultra violet radiation passing through said container to a wavelength greater than about 3, 000A. and less than about 4,000A., said liquid additionally cooling said first and second walls; d. Means for circulating said liquid through said container to remove heat from said apparatus; and e. means for holding a sample to be tested disposed adjacent to said second wall that is remote from the source, said holder being exposed to the filtered radiation which has a wavelength greater than about 3,000A. and less than about 4,000A.
Claim 6
Dependent Claim
195 words
In an apparatus for testing the color-fastness of a sample the combination comprising; a. means for providing a source of ultra violet radiation; b. Container means adapted to receive said ultra violet radiation and disposed adjacent and spaced away from said source, said container means comprising a first wall which is exposed to said source and a second wall, said walls being substantially transparent to ultra violet radiation; c. Filtering means including solid filtering means and liquid filtering means intermediate and substantially filling the spaces between said first and second walls, said liquid comprising an aqueouS solution of CoSO4 and CuSO4, said liquid and solid filter limiting the ultra violet radiation passing through said container to a wavelength greater than about 3, 000A. and less than about 4,000A., said liquid additionally cooling said first and second walls; d. Means for circulating said liquid through said container to remove heat from said apparatus; and e. means for holding a sample to be tested disposed adjacent to said second wall that is remote from the source, said holder being exposed to the filtered radiation which has a wavelength greater than about 3,000A. and less than about 4,000A.
Claim 7
Dependent Claim
73 words
Apparatus in accordance with claim 4 and additionally including particles of glass filter means disposed in and substantially filling the portion of said container means adapted to receive said liquid whereby the said liquid is flowed around and cools said particles, said particles and liquid providing a band pass of ultra violet radiation wavelength of about 3,000 to 4,000A. and thereby assist in limiting said ultra violet radiation to an effective fading region.
Claim 8
Dependent Claim
24 words
Apparatus in accordance with claim 4 in which said aqueous solution comprises 1 gram CuSO4.5H2O and 2.5 grams CoSO4.7H2O per 10 cc of water.
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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |