Patent US2828905A successfully refreshed from Google Patents.
Patent US3246250A successfully refreshed from Google Patents.
US3246250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Industrial process control apparatus
Assignee: Schneider Electric Systems USA Inc
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Filing: 1964-11-13
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Granted: 1966-04-12
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Expires: 1984-11-13
Abstract
No abstract record available.
Inventors
- 👤 Jr Alfred Nazareth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:34
CPC Classifications
G; G05; G05B; G05B7/00; G05B7/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
A PROCESS CONTROLLER COMPRISING AMPLIFIER MEANS HAVING AN INPUT CIRCUIT TO RECEIVE A CONDITION-RESPONSIVE SIGNAL AND ADAPTED TO PRODUCE AN AUTOMATIC CONTROL SIGNAL FOR TRANSMISSION TO A DEVICE FOR OPERATING A PROCESS VALVE OR THE LIKE, NEGATIVE FEEDBACK MEANS FOR SAID AMPLIFIER INCLUDING ENERGY STORAGE MEANS TO DEVELOP RESET ACTION IN SAID AUTOMATIC CONTROL SIGNAL; AN ADJUSTABLE SIGNAL SOURCE FOR PRODUCING A MANUAL CONTROL SIGNAL FOR SAID OPERATING DEVICE; AND SWITCH MEANS HAVING "AUTOMATIC" AND "MANUAL" POSITIONS, SAID SWITCH MEANS SERVING WHEN IN "AUTOMATIC" POSITION TO CONNECT SAID AUTOMATIC CONTROL SIGNAL TO SAID OPERATING DEVICE; SAID SWITCH MEANS SERVING WHEN IN "MANUAL" POSITION TO CONNECT SAID MANUAL CONTROL SIGNAL TO SAID OPERATING DEVICE IN PLACE OF SAID AUTOMATIC CONTROL SIGNAL, AND TO CONNECT SAID CONDITION-RESPONSIVE SIGNAL TO SAID RESET MAINTAINED ENERGIZED AT THE LEVEL OF SAID SIGNAL.
Claim 2
Dependent Claim
137 words
A PROCESS CONTROLLER COMPRISING AMPLIFIER MEANS HAVING AN INPUT CIRCUIT TO RECEIVE A CONDITION-RESPONSIVE SIGNAL AND ADAPTED TO PRODUCE AN AUTOMATIC CONTROL SIGNAL FOR TRANSMISSION TO A DEVICE FOR OPERATING A PROCESS VALVE OR THE LIKE, NEGATIVE FEEDBACK MEANS FOR SAID AMPLIFIER INCLUDING ENERGY STORAGE MEANS TO DEVELOP RESET ACTION IN SAID AUTOMATIC CONTROL SIGNAL; AN ADJUSTABLE SIGNAL SOURCE FOR PRODUCING A MANUAL CONTROL SIGNAL FOR SAID OPERATING DEVICE; AND SWITCH MEANS HAVING "AUTOMATIC" AND "MANUAL" POSITIONS, SAID SWITCH MEANS SERVING WHEN IN "AUTOMATIC" POSITION TO CONNECT SAID AUTOMATIC CONTROL SIGNAL TO SAID OPERATING DEVICE; SAID SWITCH MEANS SERVING WHEN IN "MANUAL" POSITION TO CONNECT SAID MANUAL CONTROL SIGNAL TO SAID OPERATING DEVICE IN PLACE OF SAID AUTOMATIC CONTROL SIGNAL, AND TO CONNECT SAID CONDITION-RESPONSIVE SIGNAL TO SAID RESET MAINTAINED ENERGIZED AT THE LEVEL OF SAID SIGNAL.
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) | 1969-04-11 | 1969-10-11 | 1970-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-11 | 1973-10-11 | 1974-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-11 | 1977-10-11 | 1978-04-12 | $7700.00 | Window Closed / Lapsed |