US3322959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoelectric level control system with lamp operated at alternate brightnesses
Assignee: Robertshaw US Holding Corp
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Filing: 1963-05-09
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Granted: 1967-05-30
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Expires: 1983-05-09
Abstract
No abstract record available.
Inventors
- 👤 Jerome L Lorenz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:16
CPC Classifications
F; F25; F25C; F25C5/00; F25C5/18; F25C5/182; F25C5/187; G; G01; G01F; G01F23/00; G01F23/22; G01F23/28; G01F23/284; G01F23/292; G01F23/2921
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
A PHOTOELECTRIC CONTROL MEANS COMPRISING IN COMBINATION: (A) A LIGHT SOURCE, (B) MEANS FOR NORMALLY ENERGIZING SAID LIGHT SOURCE TO PROVIDE A BEAM OF FIRST INTENSITY, (C) A LIGHT ACTIVATED SWITCH MOUNTED TO RECEIVE SAID BEAM AND HAVING A THRESHOLD OF ACTIVATION BELOW SAID FIRST INTENSITY, (D) LOAD MEANS CONNECTED TO BE ENERGIZED BY ACTIVATION OF SAID LIGHT ACTIVATED SWITCH, AND (E) MEANS TO CONTROL THE INTENSITY OF SAID LIGH SOURCE IN RESPONSE TO ACTIVATION OF SAID LIGHT ACTIVATED SWITCH TO INCREASE THE INTENSITY OF SAID BEAM AND RESPONSIVE TO DEACTIVATION OF SAID SWITCH TO REDUCE THE INTENSITY OF SAID BEAM TO SAID FIRST INTENSITY, WHEREBY AN APPRECIABLE CHANGE IN INTERFERENCE WITH SAID LIGHT BEAM IS NECESSARY TO CHANGE THE STATE OF ACTIVATION OF SAID
Claim 2
Dependent Claim
125 words
A PHOTOELECTRIC CONTROL MEANS COMPRISING IN COMBINATION: (A) A LIGHT SOURCE, (B) MEANS FOR NORMALLY ENERGIZING SAID LIGHT SOURCE TO PROVIDE A BEAM OF FIRST INTENSITY, (C) A LIGHT ACTIVATED SWITCH MOUNTED TO RECEIVE SAID BEAM AND HAVING A THRESHOLD OF ACTIVATION BELOW SAID FIRST INTENSITY, (D) LOAD MEANS CONNECTED TO BE ENERGIZED BY ACTIVATION OF SAID LIGHT ACTIVATED SWITCH, AND (E) MEANS TO CONTROL THE INTENSITY OF SAID LIGH SOURCE IN RESPONSE TO ACTIVATION OF SAID LIGHT ACTIVATED SWITCH TO INCREASE THE INTENSITY OF SAID BEAM AND RESPONSIVE TO DEACTIVATION OF SAID SWITCH TO REDUCE THE INTENSITY OF SAID BEAM TO SAID FIRST INTENSITY, WHEREBY AN APPRECIABLE CHANGE IN INTERFERENCE WITH SAID LIGHT BEAM IS NECESSARY TO CHANGE THE STATE OF ACTIVATION OF SAID
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-05-29 | 1970-11-28 | 1971-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-29 | 1974-11-28 | 1975-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-29 | 1978-11-28 | 1979-05-30 | $7700.00 | Window Closed / Lapsed |