US3242341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical safety control
Assignee: Unisys Corp
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Filing: 1965-06-10
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Granted: 1966-03-22
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Expires: 1985-06-10
Abstract
No abstract record available.
Inventors
- 👤 Benjamin W Woodward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:29
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/18; G08B13/181; G08B13/183; F; F16; F16P; F16P3/00; F16P3/12; F16P3/14; F16P3/144
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
172 words
AN ELECTRICAL CONTROL COMPRISING: (A) A TWO STAGE DIRECT RESISTANCE COUPLED AMPLIFIER HAVING A FIRST STAGE AMPLIFIER AND AT LEAST TWO ELECTRICALLY ISOLATED INDEPENDENTLY OPERATING AMPLIFIERS IN ITS OUTPUT STAGE FOR PRODUCING INDEPENDENT ISOLATED OUTPUT SIGNALS IN RESPONSE TO A SIGNAL FROM THE FIRST STAGE AMPLIFIER; (B) OFJECT DETECTING MEANS RESPONSIVE TO THE PRESENCE OF A PHYSICAL OBJECT WITHIN A PREDETERMINED GUARDED AREA FOR APPLYING A CERTAIN SIGNAL AS AN INPUT TO SAID FIRST STAGE AMPLIFIER WHEN THE GUARDED AREA IS FREE OF OBJECTS; (C) MAIN CONTROL MEANS GOING FROM A FIRST TO A SECOND CONTROL CONDITION RESPONSIVE TO THE SIMULTANEOUS PRESENCE OF THE INDEPENDENT ISOLATED OUTPUT SIGNALS, AND IN THE ABSENCE OF SAID SIMULTANEOUS PRESENCE OF SAID INDEPENDENT SIGNALS AUTOMATICALLY BEING RETURNED TO SAID FIRST CONTRROL CONDITION, AND (D) SUPERVISORY MEANS CONNECTED TO THE FIRST STAGE AMPLIFIER TO ACTUATE SAID MAIN CONTROL MEANS BACK TO SAID FIRST CONTROL CONDITION AND PREVENTING ACTUATION OF SAID MAIN CONTROL MEANS TO SAID SECOND CONTROL CONDITION WHEN THE FIRST STAGE SIGNAL EXCEEDS A PREDETERMINED AMOUNT.
Claim 2
Dependent Claim
172 words
AN ELECTRICAL CONTROL COMPRISING: (A) A TWO STAGE DIRECT RESISTANCE COUPLED AMPLIFIER HAVING A FIRST STAGE AMPLIFIER AND AT LEAST TWO ELECTRICALLY ISOLATED INDEPENDENTLY OPERATING AMPLIFIERS IN ITS OUTPUT STAGE FOR PRODUCING INDEPENDENT ISOLATED OUTPUT SIGNALS IN RESPONSE TO A SIGNAL FROM THE FIRST STAGE AMPLIFIER; (B) OFJECT DETECTING MEANS RESPONSIVE TO THE PRESENCE OF A PHYSICAL OBJECT WITHIN A PREDETERMINED GUARDED AREA FOR APPLYING A CERTAIN SIGNAL AS AN INPUT TO SAID FIRST STAGE AMPLIFIER WHEN THE GUARDED AREA IS FREE OF OBJECTS; (C) MAIN CONTROL MEANS GOING FROM A FIRST TO A SECOND CONTROL CONDITION RESPONSIVE TO THE SIMULTANEOUS PRESENCE OF THE INDEPENDENT ISOLATED OUTPUT SIGNALS, AND IN THE ABSENCE OF SAID SIMULTANEOUS PRESENCE OF SAID INDEPENDENT SIGNALS AUTOMATICALLY BEING RETURNED TO SAID FIRST CONTRROL CONDITION, AND (D) SUPERVISORY MEANS CONNECTED TO THE FIRST STAGE AMPLIFIER TO ACTUATE SAID MAIN CONTROL MEANS BACK TO SAID FIRST CONTROL CONDITION AND PREVENTING ACTUATION OF SAID MAIN CONTROL MEANS TO SAID SECOND CONTROL CONDITION WHEN THE FIRST STAGE SIGNAL EXCEEDS A PREDETERMINED AMOUNT.
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) | 1969-03-21 | 1969-09-20 | 1970-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-21 | 1973-09-20 | 1974-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-21 | 1977-09-20 | 1978-03-22 | $7700.00 | Window Closed / Lapsed |