US3133502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control systems for multiple pump installations
Assignee: Individual
•
Filing: 1963-02-18
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Granted: 1964-05-19
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Expires: 1983-02-18
Abstract
No abstract record available.
Inventors
- 👤 John P Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:41
CPC Classifications
F; F04; F04D; F04D15/00; F04D15/0072
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
IN A PIPING INSTALLATION UTILIZING A PLURALITY OF PUMPS FOR MAINTAINING THE REQUIRED LIQUID PRESSURE AND FLOW, A SYSTEM COMPRISING: A FIRST PUMP CONNECTED BETWEEN THE MAIN WATER SUPPLY LINE AND PIPES THAT FURNISH WATER TO THE VARIOUS OUTLETS IN THE BUILDING; A SECOND PUMP ALSO OPERATIVELY INTERPOSED BETWEEN SAID LINE AND SAID OUTLETS; A FIRST ELECTRIC MOTOR FOR DRIVING SAID FIRST PUMP; A SECOND ELECTRIC MOTOR FOR DRIVING SAID SECOND PUMP; AND CURRENT SENSITIVE MEANS COMPRISING AT LEAST ONE RELAY HAVING (A) AT LEAST ONE MAGNETIC OPERATING COIL CONNECTED IN SERIES WITH SAID FIRST MOTOR, AND (B) CONTACTS THAT CLOSE WHEN THE CURRENT IN SAID COIL REACHES A PRE-SELECTED HIGH VALUE AND OPEN WHEN SAID CURRENT DROPS TO A PRE-SELECTED LOW VALUE, SAID MEANS ACTING TO ENERGIZE SAID SECOND MOTOR IN RESPONSE TO THE CLOSING OF SAID CONTACTS AND TO DEENERGIZE SAID SECOND MOTOR UPON THE OPENING OF SAID CONTACTS.
Claim 2
Dependent Claim
151 words
IN A PIPING INSTALLATION UTILIZING A PLURALITY OF PUMPS FOR MAINTAINING THE REQUIRED LIQUID PRESSURE AND FLOW, A SYSTEM COMPRISING: A FIRST PUMP CONNECTED BETWEEN THE MAIN WATER SUPPLY LINE AND PIPES THAT FURNISH WATER TO THE VARIOUS OUTLETS IN THE BUILDING; A SECOND PUMP ALSO OPERATIVELY INTERPOSED BETWEEN SAID LINE AND SAID OUTLETS; A FIRST ELECTRIC MOTOR FOR DRIVING SAID FIRST PUMP; A SECOND ELECTRIC MOTOR FOR DRIVING SAID SECOND PUMP; AND CURRENT SENSITIVE MEANS COMPRISING AT LEAST ONE RELAY HAVING (A) AT LEAST ONE MAGNETIC OPERATING COIL CONNECTED IN SERIES WITH SAID FIRST MOTOR, AND (B) CONTACTS THAT CLOSE WHEN THE CURRENT IN SAID COIL REACHES A PRE-SELECTED HIGH VALUE AND OPEN WHEN SAID CURRENT DROPS TO A PRE-SELECTED LOW VALUE, SAID MEANS ACTING TO ENERGIZE SAID SECOND MOTOR IN RESPONSE TO THE CLOSING OF SAID CONTACTS AND TO DEENERGIZE SAID SECOND MOTOR UPON THE OPENING OF SAID CONTACTS.
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) | 1967-05-19 | 1967-11-18 | 1968-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-19 | 1971-11-18 | 1972-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-19 | 1975-11-18 | 1976-05-19 | $7700.00 | Window Closed / Lapsed |