US3281574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressurized baseboard-type electrical heater and method of charging same
Assignee: INTERNATIONAL OIL BURNER CO
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Filing: 1964-03-16
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Granted: 1966-10-25
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Expires: 1984-03-16
Abstract
No abstract record available.
Inventors
- 👤 Sidney J Heiman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:31
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/002; F24H3/004
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
THE METHOD OF CHARGING AN ELECTRICAL BASEBOARD HEATER OF THE TYPE HAVING A CONTINUOUS AND SEALED LIQUID CIRCULATION PASSAGE, AN ELECTRICAL HEATING ELEMENT SEALED THEREIN, AND AN EXPANSION CHAMBER COMMUNICATING WITH THE PASSAGE AND EXTENDING UPWARDLY THEREFROM TO AN UPPER CHAMBER END OPENING, COMPRISING THE STEPS OF FILLING A HEAT TRANSFER LIQUID AT ROOM TEMPERATURE AND ATMOSPHERIC PRESSURE THROUGH THE UPPER END OPENING OF THE EXPANSION CHAMBER IN A QUANTITY SUFFICIENT TO FILL THE LIQUID CIRCULATION PASSAGE, PRESSURE-FILLING THE EXPANSION CHAMBER WITH A GAS THROUGH SAID UPPER END OPENING TO A PRESSURE SUBSTANTIALLY ABOVE ATMOSPHERIC PRESSURE, AND THEN PERMANENTLY SEALING SAID UPPER END OPENING OF THE EXPANSION CHAMBER, WHEREBY THE EXCESS PRESSURE OVER ATMOSPHERIC PRESSURE SUPPRESSES NOISES ATTENDANT TO HEATING THE HEAT TRANSFER LIQUID.
Claim 2
Independent Claim
124 words
THE METHOD OF CHARGING AN ELECTRICAL BASEBOARD HEATER OF THE TYPE HAVING A CONTINUOUS AND SEALED LIQUID CIRCULATION PASSAGE, AN ELECTRICAL HEATING ELEMENT SEALED THEREIN, AND AN EXPANSION CHAMBER COMMUNICATING WITH THE PASSAGE AND EXTENDING UPWARDLY THEREFROM TO AN UPPER CHAMBER END OPENING, COMPRISING THE STEPS OF FILLING A HEAT TRANSFER LIQUID AT ROOM TEMPERATURE AND ATMOSPHERIC PRESSURE THROUGH THE UPPER END OPENING OF THE EXPANSION CHAMBER IN A QUANTITY SUFFICIENT TO FILL THE LIQUID CIRCULATION PASSAGE, PRESSURE-FILLING THE EXPANSION CHAMBER WITH A GAS THROUGH SAID UPPER END OPENING TO A PRESSURE SUBSTANTIALLY ABOVE ATMOSPHERIC PRESSURE, AND THEN PERMANENTLY SEALING SAID UPPER END OPENING OF THE EXPANSION CHAMBER, WHEREBY THE EXCESS PRESSURE OVER ATMOSPHERIC PRESSURE SUPPRESSES NOISES ATTENDANT TO HEATING THE HEAT TRANSFER LIQUID.
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) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |