Patent US502819A successfully refreshed from Google Patents.
Patent US3154394A successfully refreshed from Google Patents.
US3154394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching system comprising a source of liquified gas
Assignee: US Philips Corp
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Filing: 1961-04-27
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Granted: 1964-10-27
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Expires: 1981-04-27
Abstract
No abstract record available.
Inventors
- 👤 Ster Johannes Van Der
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:10
CPC Classifications
F; F25; F25J; F25J5/00; F04; F04F; F04F1/00; F04F1/18; F17; F17C; F17C9/00; F17C9/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
171 words
A SYSTEM FOR SWITCHING OVER HEAT EXCHANGERS ASSOCIATED WITH A COLD SOURCE COMPRISING A PLURALITY OF HEAT EXCHANGERS ADAPTED TO BE SWITCHED OVER, MEANS FOR FEEDING GAS TO SAID HEAT EXCHANGERS AND SAID COLD SOURCE AND CONDENSING THE OUTPUT THEREFROM TO FORM LIQUIFIED GAS, A VESSEL HAVING ITS BOTTOM LOCATED AT A LEVEL BELOW THE BOTTOMS OF SAID HEAT EXCHANGERS, A CONDUIT CONNECTING SAID COLD SOURCE TO SAID VESSEL WHEREBY SAID LIQUIFIED GAS IS CONDUCTED THERETO AND STORED THEREIN, A PLURALITY OF VAPOR LIFT PUMPS HAVING THE LOWER ENDS THEREOF SUBMERGED IN THE LIQUIFIED GAS IN SAID VESSEL AND UPPER ENDS IN COMMUNICATION WITH SAID HEAT EXCHANGERS WHICH ARE ADAPTED TO TRANSPORT SAID LIQUIFIED GAS IN AN UPWARD DIRECTION TO SAID HEAT EXCHANGERS; HEATING DEVICES FOR EACH VAPOR LIFT PUMP, A SOURCE OF POWER, AND CURRENT SUPPLY WIRES PROVIDED WITH A SWITCH FOR ELECTRICALLY CONNECTING SAID SOURCE OF POWER TO SELECTED CURRENT SUPPLY WIRES WHEREBY SAID VAPOR LIFT PUMPS ARE ELECTRICALLY ACTUATED AND FUNCTION AS SWITCHING ELEMENTS FOR SAID HEAT EXCHANGERS.
Claim 2
Independent Claim
171 words
A SYSTEM FOR SWITCHING OVER HEAT EXCHANGERS ASSOCIATED WITH A COLD SOURCE COMPRISING A PLURALITY OF HEAT EXCHANGERS ADAPTED TO BE SWITCHED OVER, MEANS FOR FEEDING GAS TO SAID HEAT EXCHANGERS AND SAID COLD SOURCE AND CONDENSING THE OUTPUT THEREFROM TO FORM LIQUIFIED GAS, A VESSEL HAVING ITS BOTTOM LOCATED AT A LEVEL BELOW THE BOTTOMS OF SAID HEAT EXCHANGERS, A CONDUIT CONNECTING SAID COLD SOURCE TO SAID VESSEL WHEREBY SAID LIQUIFIED GAS IS CONDUCTED THERETO AND STORED THEREIN, A PLURALITY OF VAPOR LIFT PUMPS HAVING THE LOWER ENDS THEREOF SUBMERGED IN THE LIQUIFIED GAS IN SAID VESSEL AND UPPER ENDS IN COMMUNICATION WITH SAID HEAT EXCHANGERS WHICH ARE ADAPTED TO TRANSPORT SAID LIQUIFIED GAS IN AN UPWARD DIRECTION TO SAID HEAT EXCHANGERS; HEATING DEVICES FOR EACH VAPOR LIFT PUMP, A SOURCE OF POWER, AND CURRENT SUPPLY WIRES PROVIDED WITH A SWITCH FOR ELECTRICALLY CONNECTING SAID SOURCE OF POWER TO SELECTED CURRENT SUPPLY WIRES WHEREBY SAID VAPOR LIFT PUMPS ARE ELECTRICALLY ACTUATED AND FUNCTION AS SWITCHING ELEMENTS FOR SAID HEAT EXCHANGERS.
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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) | 1967-10-27 | 1968-04-27 | 1968-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-27 | 1972-04-27 | 1972-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-27 | 1976-04-27 | 1976-10-27 | $7700.00 | Window Closed / Lapsed |