US3767956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aperture fluorescent lamp for copying machines
Assignee: Xerox Corp
•
Filing: 1969-12-24
•
Granted: 1973-10-23
•
Expires: 1989-12-24
Abstract
Abstract An aperture fluorescent lamp wherein luminous flux is radiated uniformly along the aperture. In a first embodiment, a variable area aperture is provided. In the second embodiment, a variable area reflector is formed on the outside surface of the lamp.
Inventors
- 👤 G Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:43
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/30; H01J61/35
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
108 words
An aperture fluorescent lamp comprising: an elongated tubular glass envelope having electrodes sealed into its opposite ends and containing an ionizable medium therein; a coating applied to the interior surface of said glass envelope, said coating comprising a phosphor layer extending over the entire interior of said envelope except for a narrow aperture extending along substantially the whole length of said envelope; and a reflecting member formed on the exterior surface of said glass envelope except for the aperture, the surface area of said reflecting member being greatest towards the ends of said envelope whereby substantially uniform luminous intensity is achieved along the whole length of said aperture.
Claim 2
Dependent Claim
108 words
An aperture fluorescent lamp comprising: an elongated tubular glass envelope having electrodes sealed into its opposite ends and containing an ionizable medium therein; a coating applied to the interior surface of said glass envelope, said coating comprising a phosphor layer extending over the entire interior of said envelope except for a narrow aperture extending along substantially the whole length of said envelope; and a reflecting member formed on the exterior surface of said glass envelope except for the aperture, the surface area of said reflecting member being greatest towards the ends of said envelope whereby substantially uniform luminous intensity is achieved along the whole length of said aperture.
Claim 3
Dependent Claim
90 words
An aperture flourescent lamp comprising: an elongated tubular glass envelope having electrodes sealed into its opposite ends and containing an ionizable medium therein; a phosphor coating extending over the entire interior of said envelope; and a reflecting member formed on the exterior surface of said glass envelope except for a narrow aperture extending along substantially the whole length of said envelope, the surface area of said reflecting member being greatest towards the ends of said envelope whereby substantially uniform luminous intensity is achieved along the whole length of said aperture.
Claim 4
Dependent Claim
90 words
An aperture flourescent lamp comprising: an elongated tubular glass envelope having electrodes sealed into its opposite ends and containing an ionizable medium therein; a phosphor coating extending over the entire interior of said envelope; and a reflecting member formed on the exterior surface of said glass envelope except for a narrow aperture extending along substantially the whole length of said envelope, the surface area of said reflecting member being greatest towards the ends of said envelope whereby substantially uniform luminous intensity is achieved along the whole length of said aperture.
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |