US3703338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Veiling reflection and illumination meter
Assignee: Kollmorgen Corp
•
Filing: 1971-05-06
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Granted: 1972-11-21
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Expires: 1991-05-06
Abstract
Abstract The tendency of illumination on a study desk task to produce veiling reflections is measured by a meter connected to two photocells arranged to measure both the total illumination and the portion thereof that will produce veiling reflections.
Inventors
- 👤 Edwin J Breneman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:18
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/42; G01J1/4228; G01J1/02; G01J1/04; G01J1/0407; G01J1/0474
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
87 words
Apparatus for indicating the veiling reflection over an illuminated work surface comprising a casing adapted to be placed over said surface, an indicating meter in said casing, a pair of photocells positioned in said casing, circuit means for alternately connecting said photocells to said meter, one of said photocells being positioned to receive light reflected from said surface and the other photocell being positioned to receive light incident upon said surface, the ratio between alternate indications of said meter determining the veiling reflection of said work surface.
Claim 2
Dependent Claim
87 words
Apparatus for indicating the veiling reflection over an illuminated work surface comprising a casing adapted to be placed over said surface, an indicating meter in said casing, a pair of photocells positioned in said casing, circuit means for alternately connecting said photocells to said meter, one of said photocells being positioned to receive light reflected from said surface and the other photocell being positioned to receive light incident upon said surface, the ratio between alternate indications of said meter determining the veiling reflection of said work surface.
Claim 3
Dependent Claim
87 words
Apparatus for indicating the veiling reflection over an illuminated work surface comprising a casing adapted to be placed over said surface, an indicating meter in said casing, a pair of photocells positioned in said casing, circuit means for alternately connecting said photocells to said meter, one of said photocells being positioned to receive light reflected from said surface and the other photocell being positioned to receive light incident upon said surface, the ratio between alternate indications of said meter determining the veiling reflection of said work surface.
Claim 4
Dependent Claim
87 words
Apparatus for indicating the veiling reflection over an illuminated work surface comprising a casing adapted to be placed over said surface, an indicating meter in said casing, a pair of photocells positioned in said casing, circuit means for alternately connecting said photocells to said meter, one of said photocells being positioned to receive light reflected from said surface and the other photocell being positioned to receive light incident upon said surface, the ratio between alternate indications of said meter determining the veiling reflection of said work surface.
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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) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |