Patent US4002894A successfully refreshed from Google Patents.
US4002894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lighting fixture with a diagonally arranged lamp
Assignee: Siemens AG
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Filing: 1975-04-07
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Granted: 1977-01-11
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Expires: 1995-04-07
Abstract
Abstract An essentially rotationally symmetrical light distribution pattern in the horizontal plane is achieved using a lighting fixture having a reflector in the form of a truncated pyramid with a high pressure discharge lamp having a linear arc arranged so that the principal radiation directions from the lamp which are perpendicular to the longitudinal axis of the arc point toward opposite corners of the reflector.
Inventors
- 👤 Harry Kintz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:13
CPC Classifications
F; F21; F21V; F21V7/00; F21V7/005
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
82 words
In a lighting fixture for discharge lamp of high brightness, said lamp being of the type having a linear inner bulb containing a burning arc, with a reflector in the form of a truncated pyramid with a rectangular light egress opening, the improvement comprising means for supporting the discharge lamp within the reflector so that the principal radiation directions of the lamp which are perpendicular to the longitudinal axis of the inner bulb point toward two diametrically opposed corners of the reflector.
Claim 2
Dependent Claim
82 words
In a lighting fixture for discharge lamp of high brightness, said lamp being of the type having a linear inner bulb containing a burning arc, with a reflector in the form of a truncated pyramid with a rectangular light egress opening, the improvement comprising means for supporting the discharge lamp within the reflector so that the principal radiation directions of the lamp which are perpendicular to the longitudinal axis of the inner bulb point toward two diametrically opposed corners of the reflector.
Claim 3
Dependent Claim
14 words
A light fixture according to claim 1 wherein said light egress opening is square.
Claim 4
Dependent Claim
43 words
A lighting fixture according to claim 1 wherein the discharge lamp has a clear glass outer bulb and wherein the ratio of the optically effective arc length to the diagonal of the light egress opening of the reflector is between 0.08 and 0.17.
Claim 5
Dependent Claim
16 words
A lighting fixture according to claim 3 wherein said discharge lamp has bases on both sides.
Claim 6
Dependent Claim
26 words
A lighting fixture according to claim 4 wherein the axis of the arc of the lamp is parallel to the plane of the light egress opening.
Claim 7
Dependent Claim
26 words
A lighting fixture according to claim 3 wherein the axis of the arc of the lamp is parallel to the plane of the light egress opening.
Claim 8
Dependent Claim
14 words
A lighting fixture according to claim 6 wherein said light egress opening is square.
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) | 1980-01-11 | 1980-07-12 | 1981-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-11 | 1984-07-12 | 1985-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-11 | 1988-07-12 | 1989-01-11 | $7700.00 | Window Closed / Lapsed |