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Patent US3626288A successfully refreshed from Google Patents.
US3626288A
Expired / Lapsed
US
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Apparatus for detecting conductive material utilizing a vapor lamp
Assignee: Individual
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Filing: 1969-10-27
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Granted: 1971-12-07
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Expires: 1989-10-27
Abstract
Abstract A proximity or a probe contact control for a conveyor carrying electrically conductive material has a shielded fluorescent lamp, a sensing probe connected to the shield, a direct current plate potential charging means for the lamp, a discharge circuit connected in series with the lamp, a relay means responsive to the discharge circuit wherein the static bias on the lamp shield is changed by the change in level of conductive material initiating current flow in the lamp to actuate responsive relay means.
Inventors
- 👤 Victor R Bart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:58
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/24; G01F23/241; B; B65; B65G; B65G47/00; G01V; G01V3/00; G01V3/08; G01V3/088; B65G2811/00; B65G2811/06; B65G2811/0673; B65G2811/0689; B65G2811/0694
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
136 words
Apparatus for detecting conductive material comprising a vapor lamp; electrically conductive means surrounding at least a portion of the periphery of said lamp and extending to a position adjacent the conductive material; an AC power source; a biasing circuit for supplying a high-potential DC charge to said lamp, said circuit including a first capacitor in series with said lamp, a first rectifier, a second rectifier, a resistance connected between said rectifiers, said rectifiers and resistance being connected in parallel with said first capacitor, and a second capacitor having one side connected to one lead of said power source and the other side connected between said first rectifier and resistance; a relay coil in series with said lamp and said first capacitor, and means operable by said relay coil to indicate the presence of said conductive material.
Claim 2
Dependent Claim
136 words
Apparatus for detecting conductive material comprising a vapor lamp; electrically conductive means surrounding at least a portion of the periphery of said lamp and extending to a position adjacent the conductive material; an AC power source; a biasing circuit for supplying a high-potential DC charge to said lamp, said circuit including a first capacitor in series with said lamp, a first rectifier, a second rectifier, a resistance connected between said rectifiers, said rectifiers and resistance being connected in parallel with said first capacitor, and a second capacitor having one side connected to one lead of said power source and the other side connected between said first rectifier and resistance; a relay coil in series with said lamp and said first capacitor, and means operable by said relay coil to indicate the presence of said conductive material.
Claim 3
Dependent Claim
48 words
Apparatus according to claim 1 wherein the electrically conductive means surrounding the periphery of said lamp includes a shield for said lamp, a conductive probe mounted adjacent the conductive material, said conductive material being located between said probe and ground, and means connecting the probe to said shield.
Claim 4
Dependent Claim
13 words
Apparatus according to claim 2 wherein the vapor lamp is a fluorescent lamp.
Claim 5
Dependent Claim
30 words
Apparatus according to claim 1 in which said conductive material is carried on a conveyor, and said apparatus includes means operable by said relay coil to control the conveyor operation.
Claim 6
Dependent Claim
47 words
Apparatus according to claim 4 wherein the electrically conductive means surrounding the periphery of said lamp includes a shield for said lamp, said conductive material being located between said probe and ground, a conductive probe mounted adjacent the conveyor, and means connecting the probe to said shield.
Claim 7
Dependent Claim
13 words
Apparatus according to claim 5 wherein the vapor lamp is a fluorescent lamp.
Claim 8
Dependent Claim
19 words
Apparatus according to claim 5 including a current-limiting circuit connected in series between said lamp and said first capacitor.
Claim 9
Dependent Claim
59 words
Apparatus according to claim 1 in which said relay coil operates two normally closed contacts and a normally open contact, said relay coil being connected in series with the first normally closed contact, said second capacitor being connected in series with the second normally closed contact, and said normally open contact being connected in series with the indicating means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |