US3103575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
pecci
Assignee: —
•
Filing: —
•
Granted: 1963-09-10
•
Expires: 1980-09-10
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:42
CPC Classifications
F; F24; F24D; F24D11/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
202 words
A SPACE HEATING SYSTEM COMPRISING A HORIZONTAL CYLINDRICAL BOILER, A PLURALITY OF ELECTRIC HEATING UNITS APPLIED TO SAID BOILER, SAID BOILER HAVING SUPPLY AND RETURN CONNECTIONS FOR MOTIVE FLUID, A SUBSTANTIALLY VERTICAL HOUSING PROJECTING FROM ONE END OF SAID BOILER AND HAVING A WIDTH SUBSTANTIALLY LESS THAN THE DIAMETER OF THE BOILER, A WATER HEATING COIL POSITIONED IN SAID HOUSING, CONNECTIONS IN SAID HOUSING FOR THE SUPPLY OF FRESH WATER TO SAID COIL AND ITS DISCHARGE THEREFROM, A BY-PASS FROM SAID SUPPLY TO SAID DISCHARGE, A TEMPERATURE-RESPONSIVE MIXING VALVE AT THE JUNCTION OF THE SUPPLY AND SAID DISCHARGE, SAID BOILER HAVING CONNECTIONS FOR THE SUPPLY OF MAKE-UP WATER, AND MEANS FOR CONTROLLING THE OPERATION OF SAID HEATING UNITS, SAID CONTROL MEANS COMPRISING A MANUAL MAIN LINE SWITCH, A MAGNETIC MAIN SWITCH CONNECTED TO SAID MAIN LINE SWITCH, A SERIES CONNECTED WATER LEVEL-RESPONSIVE SWITCH, PRESSURE RESPONSIVE SWITCH AND TEMPERATURE-RESPONSIVE SWITCH ON SAID BOILER, SAID MAGNETIC MAIN SWITCH BEING CLOSED BY A GROUNDED CIRCUIT FROM ONE OF THE LEADS OF SAID MAIN LINE SWITCH THROUGH SAID WATER LEVEL, PRESSURE AND TEMPERATURE RESPONSIVE SWITCHES, WHEREBY SAID MAGNETIC MAIN SWITCH NORMALLY REMAINS CLOSED WHEN SAID MAIN LINE SWITCH IS CLOSED SUBJECT TO BEING OPENED BY THE
Claim 2
Dependent Claim
202 words
A SPACE HEATING SYSTEM COMPRISING A HORIZONTAL CYLINDRICAL BOILER, A PLURALITY OF ELECTRIC HEATING UNITS APPLIED TO SAID BOILER, SAID BOILER HAVING SUPPLY AND RETURN CONNECTIONS FOR MOTIVE FLUID, A SUBSTANTIALLY VERTICAL HOUSING PROJECTING FROM ONE END OF SAID BOILER AND HAVING A WIDTH SUBSTANTIALLY LESS THAN THE DIAMETER OF THE BOILER, A WATER HEATING COIL POSITIONED IN SAID HOUSING, CONNECTIONS IN SAID HOUSING FOR THE SUPPLY OF FRESH WATER TO SAID COIL AND ITS DISCHARGE THEREFROM, A BY-PASS FROM SAID SUPPLY TO SAID DISCHARGE, A TEMPERATURE-RESPONSIVE MIXING VALVE AT THE JUNCTION OF THE SUPPLY AND SAID DISCHARGE, SAID BOILER HAVING CONNECTIONS FOR THE SUPPLY OF MAKE-UP WATER, AND MEANS FOR CONTROLLING THE OPERATION OF SAID HEATING UNITS, SAID CONTROL MEANS COMPRISING A MANUAL MAIN LINE SWITCH, A MAGNETIC MAIN SWITCH CONNECTED TO SAID MAIN LINE SWITCH, A SERIES CONNECTED WATER LEVEL-RESPONSIVE SWITCH, PRESSURE RESPONSIVE SWITCH AND TEMPERATURE-RESPONSIVE SWITCH ON SAID BOILER, SAID MAGNETIC MAIN SWITCH BEING CLOSED BY A GROUNDED CIRCUIT FROM ONE OF THE LEADS OF SAID MAIN LINE SWITCH THROUGH SAID WATER LEVEL, PRESSURE AND TEMPERATURE RESPONSIVE SWITCHES, WHEREBY SAID MAGNETIC MAIN SWITCH NORMALLY REMAINS CLOSED WHEN SAID MAIN LINE SWITCH IS CLOSED SUBJECT TO BEING OPENED BY THE
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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) | 1966-09-09 | 1967-03-11 | 1967-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-09 | 1971-03-11 | 1971-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-09 | 1975-03-11 | 1975-09-10 | $7700.00 | Window Closed / Lapsed |