US3609382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light detector with cleaning and testing means
Assignee: Forney Engineering Co
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Filing: 1969-08-15
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Granted: 1971-09-28
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Expires: 1989-08-15
Abstract
Abstract A furnace flame detector having a light-sensitive tube which can be periodically wiped clean and blocked off from the flame light to be tested. A web has a wiper section in contact with the tube and is connected with an actuating mechanism for periodically moving the wiper section over the tube. The wiper section has a centrally located aperture which permits the flame light to impinge on the sensing tube, so that when the wiper section is moved over the tube, it is cleaned and the flame light is intermittently blocked off to permit the tube to be tested.
Inventors
- 👤 William J Moore
- 👤 Donald J L Lin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:39
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/01; G01N21/15; F; F23; F23N; F23N5/00; F23N5/02; F23N5/08; F23N2229/00; F23N2229/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
96 words
A light-detecting apparatus having a light-detecting element which may be tested and cleaned periodically comprising a flexible web having a wiping section engaging said element, said section having an aperture which permits light to pass through said web and impinge upon said element, and means to move said web in relation to said element so that a portion of it always engages against said element so that light is alternately blocked and allowed to pass through said aperture to permit said element to be tested while said web removes soot or other matter from said element.
Claim 2
Dependent Claim
96 words
A light-detecting apparatus having a light-detecting element which may be tested and cleaned periodically comprising a flexible web having a wiping section engaging said element, said section having an aperture which permits light to pass through said web and impinge upon said element, and means to move said web in relation to said element so that a portion of it always engages against said element so that light is alternately blocked and allowed to pass through said aperture to permit said element to be tested while said web removes soot or other matter from said element.
Claim 3
Dependent Claim
17 words
The apparatus defined in claim 1 wherein, said means engages said web at one of its ends.
Claim 4
Dependent Claim
38 words
The apparatus defined in claim 2 wherein, the other end of said web is engaged by a spring which permits said web to oscillate under the action of said means while urging said wiping section against said element.
Claim 5
Dependent Claim
17 words
The apparatus defined in claim 2 wherein, said web has ends which extend rearwardly of said element.
Claim 6
Dependent Claim
26 words
The apparatus defined in claim 4 wherein, said means comprises a piston connected with said one end, said piston being slideable to reciprocate said one end.
Claim 7
Dependent Claim
32 words
The apparatus defined in claim 4 wherein, the other end of said web is connected with a spring which permits said web to oscillate while urging said wiping section against said element.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |