US3947714A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal iodide vapour discharge lamp
Assignee: Individual
•
Filing: 1974-11-25
•
Granted: 1976-03-30
•
Expires: 1994-11-25
Abstract
Abstract To obtain an iron spectral lamp iron iodide and hydrogen are introduced into a discharge lamp.
Inventors
- 👤 Ludwig Rehder
- 👤 Renate Kaiser
- 👤 Roland Lorenz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:45
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/12; H01J61/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
51 words
Metal iodide vapour discharge lamp comprising a discharge vessel which contains a noble gas for starting, a metal and iodine in an amount equivalent to that of the metal, characterized in that in order to obtain an iron spectral lamp the discharge vessel contains iron iodide (FeI 2 ) and hydrogen.
Claim 2
Dependent Claim
51 words
Metal iodide vapour discharge lamp comprising a discharge vessel which contains a noble gas for starting, a metal and iodine in an amount equivalent to that of the metal, characterized in that in order to obtain an iron spectral lamp the discharge vessel contains iron iodide (FeI 2 ) and hydrogen.
Claim 3
Dependent Claim
41 words
Lamp as claimed in claim 1, characterized in that the amount of iodide is from 0.1 to 5 micromoles per cm 3 of the volume of the discharge chamber and in that the hydrogen pressure is from 0.05 to 2 torr.
Claim 4
Dependent Claim
34 words
Lamp as claimed in claim 2 in which the discharge vessel is disposed in an outer envelope, characterized in that the outer envelope contains hydrogen at a pressure of from 0.3 to 20 torr.
Claim 5
Dependent Claim
25 words
Lamp as claimed in claim 3, characterized in that the outer envelope further contains a quenching gas at a pressure between 10 and 1,000 torr.
Claim 6
Dependent Claim
14 words
Lamp as claimed in claim 4, characterized in that the quenching gas is nitrogen.
References Cited (Backward Citations)
US3538373A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |