Patent US4242723A successfully refreshed from Google Patents.
US4242723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low level work area lighting system
Assignee: KCS LIGHTING Inc A CORP OF
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Filing: 1979-05-14
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Granted: 1980-12-30
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Expires: 1999-05-14
Abstract
Abstract A work area lighting system is provided including a housing containing a linear light source therein and having an open bottom end. A refractor comprising a pair of refractor plate members closes the open bottom end. The refractor includes a first member having a plurality of spaced prisms extending parallel to the light source and a second having a plurality of spaced prisms extending perpendicular to the light source. The second member underlies the first member and both are co-extensive in length with the light source. The refractor plates each have light incident and light emergent surfaces and both plates have their prisms on the light incident surface.
Inventors
- 👤 William C. Fabbri
- 👤 II Paul T. Metcalf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:59
CPC Classifications
F; F21; F21V; F21V5/00; F21V5/02; F21S; F21S8/00; F21S8/03; F21S8/033; F21V14/00; F21V14/06; F21W; F21W2131/00; F21W2131/40; F21W2131/402; F21Y; F21Y2103/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
138 words
A work area lighting system comprising: a housing positioned above a work area, said housing having an open-bottom end; a linear light source mounted within said housing; a refractor for providing substantially uniform light distribution over the work area in the direction parallel to said light source as well as the direction transverse to the light source, said refractor comprising a pair of overlying plate members mounted to said housing closing said open bottom end, said refractor including first and second refractor plate members each substantially co-extensive in length with said light source; said first plate member having a light incident surface comprising a plurality of spaced prisms extending parallel to said linear light source; and said second plate member having a light incident surface comprising a plurality of spaced prisms extending perpendicular to said linear light source.
Claim 2
Dependent Claim
138 words
A work area lighting system comprising: a housing positioned above a work area, said housing having an open-bottom end; a linear light source mounted within said housing; a refractor for providing substantially uniform light distribution over the work area in the direction parallel to said light source as well as the direction transverse to the light source, said refractor comprising a pair of overlying plate members mounted to said housing closing said open bottom end, said refractor including first and second refractor plate members each substantially co-extensive in length with said light source; said first plate member having a light incident surface comprising a plurality of spaced prisms extending parallel to said linear light source; and said second plate member having a light incident surface comprising a plurality of spaced prisms extending perpendicular to said linear light source.
Claim 3
Dependent Claim
17 words
The system in accordance with claim 1 wherein said second plate member underlies said first plate member.
Claim 4
Dependent Claim
18 words
The system in accordance with claim 2 wherein said first and second plate light emergent surfaces are flat.
Claim 5
Dependent Claim
23 words
The system in accordance with claim 1 wherein said housing includes means thereon extending longitudinally and blocking approximately half said linear light source.
Claim 6
Dependent Claim
18 words
The system in accordance with claim 4 wherein said mentioned means comprises a track which supports said refractor.
Claim 7
Dependent Claim
47 words
The system in accordance with claim 5 wherein said track is set upward from said housing open bottom end and said housing further includes a front surface which extends below said track whereby said front surface effectively blocks from view said refractor when supported on said track.
References Cited (Backward Citations)
US3222515A
Cited
US3288990A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-30 | 1984-06-30 | 1984-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-30 | 1988-06-30 | 1988-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-30 | 1992-06-30 | 1992-12-30 | $7700.00 | Window Closed / Lapsed |