US3569766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal vapor discharge lamp
Assignee: Philips North America LLC
•
Filing: 1969-03-03
•
Granted: 1971-03-09
•
Expires: 1989-03-03
Abstract
Abstract A high-pressure mercury vapor discharge lamp of the additive type which includes in the discharge sustaining fill selected quantities of thallium iodide, dysprosium bromide and mercury and which, while evidencing qualities of luminous efficiency and color rendition comparable to similar lamps, exhibits superior lamp maintenance.
Inventors
- 👤 Daniel A Larson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:13
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/12; H01J61/125; H01J61/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
93 words
An improved discharge lamp according to claim 1 wherein said mercury is initially present in an amount of from about 6.4 to 8.0 milligrams per centimeter of arc length, said thallium iodide is initially present in an amount of from about 0.2 to 2.0 milligrams per centimeter of arc length, said mercuric bromide is initially present in an amount of from about 1.0 to 3.0 milligrams per centimeter of arc length, and said dysprosium metal is initially present in an amount of from about 0.2 to 1.0 milligrams per centimeter of arc length.
Claim 2
Dependent Claim
41 words
An improved discharge lamp according to claim 2 wherein upon initial operation of said lamp said dysprosium is present in dysprosium bromide, and the relative gram atom proportions of total dysprosium to total bromide is generally such as to form DyBr3.
Claim 3
Dependent Claim
180 words
An improved discharge lamp comprising: a radiation transmitting elongated arc tube enclosing a predetermined volume; arc supporting tungsten electrodes disposed within said arc tube proximate the ends thereof and defining a predetermined arc length; lead-in conductors connected to said electrodes and sealed through said arc tube; and a discharge sustaining filling within said arc tube which initially consists essentially of a quantity of mercury which when fully vaporized during normal operation of the lamp will provide a predetermined mercury vapor pressure in said arc tube plus selected quantities of thallium iodide, mercuric bromide and dysprosium metal, said thallium iodide being initially present in an amount of from about 0.2 to 2.0 milligrams per centimeter of arc length, said mercury being initially present in an amount of from about 6.4 to 8.0 milligrams per centimeter of arc length, said mercuric bromide being initially present in an amount of from about 1.0 to 3.0 milligrams per centimeter of arc length, and said dysprosium metal being initially present in an amount of from about 0.2 to 1.0 milligrams per centimeter of arc length.
Claim 4
Dependent Claim
80 words
An improved discharge lamp according to claim 4 wherein said mercury is initially present in an amount of about 7.0 milligrams per centimeter of arc length, said thallium iodide is initially present in an amount of about 1.0 milligram per centimeter of arc length, said dysprosium metal is initially present in an amount of about 0.7 milligrams per centimeter of arc length and mercuric bromide is initially present in an amount of about 2.0 milligrams per centimeter of arc length.
References Cited (Backward Citations)
US3259777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |