Patent US3303658A successfully refreshed from Google Patents.
US3303658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vented seal for air refrigerator
Assignee: Arthur D Little Inc
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Filing: 1965-10-23
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Granted: 1967-02-14
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Expires: 1985-10-23
Abstract
No abstract record available.
Inventors
- 👤 Fred F Chellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:09
CPC Classifications
F; F25; F25B; F25B9/00; F25B9/14; Y; Y10; Y10S; Y10S277/00; Y10S277/907; Y10S277/91
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
IN A REFRIGERATOR IN WHICH A DISPLACER IS RECIPROCATED WITHIN A CYLINDRICAL HOUSING TO DEFINE THEREIN THROUGH THE MOTION OF SAID DISPLACER TWO ISOLATED CHAMBERS AT WIDELY DIFFERENT TEMPERATURES, A SEALING MEANS ADAPTED TO PREVENT FLUID FROM LEAKING FROM THE WARMER CHAMBER TO COLD VOIDS IN THE REFRIGERATOR, SAID SEALING MEANS COMPRISING (A) TWO PARALLEL, SPACED FLUID SEALS BETWEEN THE SURFACE OF SAID DISPLACER AND THE INTERNAL WALL OF SAID CYLINDRICAL BODY; (B) A NARROW ANNULAR PASSAGE BETWEEN SAID FLUID SEALS DEFINED BETWEEN THE SURFACE OF SAID DISPLACER AND SAID INTERNAL WALL OF SAID CYLINDRICAL BODY; AND (C) FLUID COMMUNICATION MEANS BETWEEN SAID ANNULAR PASSAGE AND A LOW-PRESSURE REGION.
Claim 2
Dependent Claim
109 words
IN A REFRIGERATOR IN WHICH A DISPLACER IS RECIPROCATED WITHIN A CYLINDRICAL HOUSING TO DEFINE THEREIN THROUGH THE MOTION OF SAID DISPLACER TWO ISOLATED CHAMBERS AT WIDELY DIFFERENT TEMPERATURES, A SEALING MEANS ADAPTED TO PREVENT FLUID FROM LEAKING FROM THE WARMER CHAMBER TO COLD VOIDS IN THE REFRIGERATOR, SAID SEALING MEANS COMPRISING (A) TWO PARALLEL, SPACED FLUID SEALS BETWEEN THE SURFACE OF SAID DISPLACER AND THE INTERNAL WALL OF SAID CYLINDRICAL BODY; (B) A NARROW ANNULAR PASSAGE BETWEEN SAID FLUID SEALS DEFINED BETWEEN THE SURFACE OF SAID DISPLACER AND SAID INTERNAL WALL OF SAID CYLINDRICAL BODY; AND (C) FLUID COMMUNICATION MEANS BETWEEN SAID ANNULAR PASSAGE AND A LOW-PRESSURE REGION.
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) | 1970-02-13 | 1970-08-15 | 1971-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-13 | 1974-08-15 | 1975-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-13 | 1978-08-15 | 1979-02-14 | $7700.00 | Window Closed / Lapsed |