Patent US3629587A successfully refreshed from Google Patents.
US3629587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for measuring the germicidal action of ultraviolet radiation
Assignee: Detec SA
•
Filing: 1969-08-04
•
Granted: 1971-12-21
•
Expires: 1989-08-04
Abstract
Abstract In a device for testing the germicidal action of an ultraviolet ray tube, a photoelectric cell receives from the tube only radiation centered on the 2,537 A. line and its output is amplified to actuate an optical or acoustic signal which indicates when the energy of the radiation is below a predetermined threshold level. To prevent damage to the cell, a shutter is interposed between the tube and the cell and is withdrawn when a test is to be made.
Inventors
- 👤 Jean A Decupper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:11
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/42; G01J1/429; A; A61; A61L; A61L2/00; A61L2/02; A61L2/08; A61L2/10; A61L2/26; A61L2/28
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
28 words
a device for testing the germicidal action of radiation emitted by an ultraviolet ray tube according to claim 1, in which said signal means comprises a neon lamp.
Claim 2
Dependent Claim
28 words
A device for testing the germicidal action of radiation emitted by an ultraviolet ray tube according to claim 1, in which said signal means comprises an acoustic device.
Claim 3
Dependent Claim
54 words
A device for testing the germicidal action of radiation emitted by an ultraviolet ray tube according to claim 1, in which said amplifier comprises a transistor amplifier having a base energized by said signal output of said photoelectric cell, and including an electromagnetic relay actuated by said amplifier output for controlling said signal means.
Claim 4
Dependent Claim
50 words
A device for testing the germicidal action of radiation emitted by an ultraviolet ray tube according to claim 1, in which said signal means comprises means indicating said ultraviolet ray tube is emitting radiation having a waVelength of 2,537 A. only when said amplified output exceeds a selected threshold value.
Claim 5
Dependent Claim
115 words
Apparatus for testing the germicidal action of ultraviolet radiation comprising, an ultraviolet ray tube, a photoelectric cell, an interference filter disposed between said ultraviolet ray tube and said photoelectric cell, said interference filter having a pass band centered on the 2,537 A. line thereby to pass only radiation centered on said 2,537 A. line, an amplifier amplifying a signal output of said photoelectric cell emitted only when the radiation transmitted by said filter and detected by said photoelectric cell is of a wavelength of 2,537 A, and signal means energized and activated by the amplified output of said photoelectric cell to indicate said ultraviolet ray tube is emitting radiation having a wavelength of 2,537 A.
Claim 6
Dependent Claim
42 words
Apparatus for testing the germicidal action of ultraviolet radiation according to claim 6, including a shutter disposed between said ultraviolet ray tube and said photoelectric cell, and means for retracting said shutter from between said ultraviolet ray tube and said photoelectric cell.
References Cited (Backward Citations)
US2856539A
Cited
US3491234A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |