US3252298A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigeration systems
Assignee: Dowty Technical Developments Ltd
•
Filing: 1964-12-02
•
Granted: 1966-05-24
•
Expires: 1984-12-02
Abstract
No abstract record available.
Inventors
- 👤 Thomas D H Andrews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:04
CPC Classifications
B; B60; B60H; B60H1/00; B60H1/32; B60H1/3204; B60H1/3223; F; F25; F25B; F25B1/00; F25B1/04; F25B1/053; F25B11/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A CLOSED-CIRCUIT COMPRESSOR-TYPE REFRIGERATION SYSTEM INCLUDING, IN COMBINATION, A ROTARY COMPRESSOR FOR CIRCULATING REFRIGERANT WITHIN THE ENCLOSED CIRCUIT OF THE SYSTEM, A TURBINE CONNECTIBLE TO AN ASSOCIATED ENGINE IN A MANNER WHEREBY IT IS DRIVEN BY THE EXHAUST GASES DISCHARGING FROM THAT ENGINE, A CASING PROVIDED BETWEEN SAID COMPRESSOR AND SAID TURBINE, BEARING MEANS HOUSED WITHIN SAID CASING, A SHAFT MOUNTED IN SAID BEARING MEANS AND CONNECTING SAID TURBINE TO SAID COMPRESSOR THEREBY TO DRIVE THE COMPRESSOR WHEN THE TURBINE IS OPERATING, AND SEAL MEANS PROVIDED ALONG SAID SHAFT INCLUDING DYNAMIC SEAL MEANS EFFECTIVE ONLY WHEN THE SYSTEM IS OPERATIVE, AND STATIC SEAL MEANS EFFECTIVE ONLY WHEN THE SYSTEM IS INOPERATIVE, SAID DYNAMIC AND STATIC SEAL MEANS BEING ARRANGED IN SERIES.
Claim 2
Dependent Claim
121 words
A CLOSED-CIRCUIT COMPRESSOR-TYPE REFRIGERATION SYSTEM INCLUDING, IN COMBINATION, A ROTARY COMPRESSOR FOR CIRCULATING REFRIGERANT WITHIN THE ENCLOSED CIRCUIT OF THE SYSTEM, A TURBINE CONNECTIBLE TO AN ASSOCIATED ENGINE IN A MANNER WHEREBY IT IS DRIVEN BY THE EXHAUST GASES DISCHARGING FROM THAT ENGINE, A CASING PROVIDED BETWEEN SAID COMPRESSOR AND SAID TURBINE, BEARING MEANS HOUSED WITHIN SAID CASING, A SHAFT MOUNTED IN SAID BEARING MEANS AND CONNECTING SAID TURBINE TO SAID COMPRESSOR THEREBY TO DRIVE THE COMPRESSOR WHEN THE TURBINE IS OPERATING, AND SEAL MEANS PROVIDED ALONG SAID SHAFT INCLUDING DYNAMIC SEAL MEANS EFFECTIVE ONLY WHEN THE SYSTEM IS OPERATIVE, AND STATIC SEAL MEANS EFFECTIVE ONLY WHEN THE SYSTEM IS INOPERATIVE, SAID DYNAMIC AND STATIC SEAL MEANS BEING ARRANGED IN SERIES.
References Cited (Backward Citations)
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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) | 1969-05-23 | 1969-11-22 | 1970-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-23 | 1973-11-22 | 1974-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-23 | 1977-11-22 | 1978-05-24 | $7700.00 | Window Closed / Lapsed |