Patent US3590307A successfully refreshed from Google Patents.
US3590307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Additive-type high-pressure mercury-vapor discharge device having good ultraviolet output
Assignee: Osram GmbH
•
Filing: 1969-12-31
•
Granted: 1971-06-29
•
Expires: 1989-12-31
Abstract
Abstract A high-pressure mercury-vapor discharge device having improved ultraviolet output and maintenance of initial output during operation comprise a radiation-transmitting arc tube having a fill consisting of inert ionizable starting gas, a predetermined charge of mercury, iron, halogen (preferably iodine) as required to react with the iron to form ferrous halide, and stannic halide (preferably the iodide).
Inventors
- 👤 Alexander Dobrusskin
- 👤 Achim Lange
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:21
CPC Classifications
A; A61; A61N; A61N5/00; A61N5/06; H; H01; H01J; H01J61/00; H01J61/02; H01J61/12; H01J61/18
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
61 words
The device as specified in claim 1, wherein said iron is present in amount of from 0.01 to 1 milligram per cc. of arc tube volume, said halogen is present in amount as required to form ferrous halide with said iron, and said stannic halide is present in amount of from 0.006 to 0.6 milligram per cc. of arc tube volume.
Claim 2
Dependent Claim
19 words
The device as specified in claim 2, wherein said halogen is iodine and said stannic halide is stannic iodide.
Claim 3
Dependent Claim
57 words
The device as specified in claim 3, wherein said iron is present in amount of about 0.03 milligram per cc. of arc tube volume, said iodine is present in amount as required to form ferrous iodide with said iron, and said stannic iodide is present in amount of about 0.06 milligram per cc. of arc tube volume.
References Cited (Backward Citations)
US3234421A
Cited
US3521110A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |