Patent US3742240A successfully refreshed from Google Patents.
US3742240A
Expired / Lapsed
US
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Meter for measuring tanning capability of sunlight
Assignee: SUNDIAL Mfg CORP Ltd
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Filing: 1971-01-08
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Granted: 1973-06-26
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Expires: 1991-01-08
Abstract
Abstract The meter comprises a housing having a pair of angularly disposed apertures formed therein. A selenium photovoltaic barrier layer cell is mounted beneath each aperture. The cells are connected in parallel to a microammeter for measuring the current generated by them. A filter is provided over each aperture. This filter is adapted to pass only ultraviolet radiation having wavelengths between 300 and 390 millimicrons in amounts which are proportional to their tanning effectiveness and relative abundance. The reading given by the microammeter gives a measure of the tanning capability of sunlight at any given moment.
Inventors
- 👤 O Jonasson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:18
CPC Classifications
G; G01; G01N; G01N17/00; G01N17/004; G01J; G01J1/00; G01J1/42; G01J1/4228
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
175 words
A meter suitable for measuring the cumulative tanning capability of both direct sunlight and skylight according to both the relative abundance and the relative tanning effectiveness of particular wavebands therein, which comprises: a. a housing defining two openings angularly positioned at an interval angle of about 90* to each other; b. a filter filling each opening, said filter being adapted to pass only ultraviolet radiation having a wavelength of 300-390 millimicrons and having transmission characteristics such that ultraviolet wavebands within said wavelength pass therethrough in amounts substantially proportional to their relative abundance and tanning effectiveness; c. a pair of ultraviolet light sensitive means adapted to generate electrical energy responsive to ultraviolet radiation in an amount proportional to the amount of said ultraviolet radiation, said light sensitive means being shieldingly enclosed in said housing and mounted just below said filter so that only ultraviolet radiation passing thru said filter reaches said light sensitive means; and d. energy measuring means for visibly measuring the cumulative energy generated by both members of said pair of light sensitive means.
Claim 2
Dependent Claim
175 words
A meter suitable for measuring the cumulative tanning capability of both direct sunlight and skylight according to both the relative abundance and the relative tanning effectiveness of particular wavebands therein, which comprises: a. a housing defining two openings angularly positioned at an interval angle of about 90* to each other; b. a filter filling each opening, said filter being adapted to pass only ultraviolet radiation having a wavelength of 300-390 millimicrons and having transmission characteristics such that ultraviolet wavebands within said wavelength pass therethrough in amounts substantially proportional to their relative abundance and tanning effectiveness; c. a pair of ultraviolet light sensitive means adapted to generate electrical energy responsive to ultraviolet radiation in an amount proportional to the amount of said ultraviolet radiation, said light sensitive means being shieldingly enclosed in said housing and mounted just below said filter so that only ultraviolet radiation passing thru said filter reaches said light sensitive means; and d. energy measuring means for visibly measuring the cumulative energy generated by both members of said pair of light sensitive means.
Claim 3
Dependent Claim
50 words
A meter according to claim 1 wherein said filter has a transmission characteristic curve having transmission cut-off points below about 300 m Mu and above about 390 m Mu and a transmission peak at about 330 m Mu substantially corresponding to curve H shown in FIG. 6 of the Drawing.
Claim 4
Dependent Claim
13 words
A meter according to claim 2 wherein said filter is Corning No. 5840.
Claim 5
Dependent Claim
20 words
A meter according to claim 2 wherein said light sensitive means comprises a pair of selenium barier layer photoelectric cells.
Claim 6
Dependent Claim
14 words
A meter according to claim 2 wherein said energy measuring means is a microammeter.
Claim 7
Dependent Claim
18 words
A meter according to claim 2 wherein said openings are angularly positioned at an interval angle of 87*-90*.
Claim 8
Dependent Claim
29 words
A meter according to claim 2 wherein said light sensitive means are a pair of selenium barier layer photoelectric cells and wherein said energy measuring means is a microammeter.
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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |