Cryostat device
Abstract
Abstract IN A CRYOSTAT HAVING A HELIUM REPLENISHING BATH SEPARATED FROM A HELIUM WORKING BATH BY A FIRST FILTER ELEMENT MADE OF A MATERIAL WHICH IS AT LEAST PARTIALLY IMPERMEABLE TO GASEOUS HELIUM AND HELIUM I, AS WELL AS TO ANY HELIUM II HAVING A TEMPERATURE HIGHER THAN THAT OF THE WORKING BATH, A SECOND FILTER ELEMENT OF SUCH MATERIAL SUPPORTED IN THE REPLENISHING BATH CONTAINER SPACED FROM AND ABOVE THE FIRST FILTER ELEMENT. THE SECOND FILTER ELEMENT FORMS THE NORMAL FLOOR OF THE REPLENISHING BATH. A SPACE BETWEEN THE FIRST AND SECOND FILTER ELEMENTS IS IN COMMUNICATION WITH THE REPLENISHING BATH CONTAINER PORTION ABOVE THE REPLENISHING BATH, WHEREBY THERE IS SUBSTANTIALLY NO PRESSURE DIFFERENCE ACROSS THE SECOND FILTER ELEMENT SO THAT THE POSSIBILITY OF PRESSURE-CAUSED BREAKTHROUGH OF THE REPLENISHING HELIUM INTO THE WORKING BATH IS ELIMINATED.
Inventors
- 👤 Albrecht Elsner
- 👤 Gustav Klipping
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |