Patent US3271966A successfully refreshed from Google Patents.
US3271966A
Expired / Lapsed
US
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Cryostats
Assignee: Individual
•
Filing: 1964-09-02
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Granted: 1966-09-13
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Expires: 1984-09-02
Abstract
No abstract record available.
Inventors
- 👤 Webb Frederick John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:34
CPC Classifications
F; F17; F17C; F17C3/00; F17C3/02; F17C3/08; F17C3/085; F17C2270/00; F17C2270/05; F17C2270/0509
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
130 words
A CRYOSTAT COMPRISING A VESSEL ADAPTED TO CONTAIN A LIQUID REFRIGERANT HAVING A BOILING POINT BELOW THE AMBIENT TEMPERATURE OF SAID VESSEL AND A FIRST UPPER LIQUID LEVEL IN SAID VESSEL, MEANS FORMING A HEMISPHERICAL ROOF SURFACE DOME IN SAID VESSEL UNDER WHICH SAID REFRIGERANT HAS A SECOND LIQUID LEVEL FROM WHICH GAS EVOLVES TO RAISE THE FIRST UPPER LIQUID LEVEL OF SAID REFRIGERANT IN SAID CRYOSTAT, MEANS COMMUNICATING FROM SAID AMBIENT TO UNDER SAID DOME FOR VENTING SAID GAS FROM BENEATH SAID DOME TO REDUCE THE FIRST UPPER LIQUID LEVEL OF SAID REFRIGERANT IN SAID CRYOSTAT, AND MEANS CONTROLLING THE VENTING OF SAID GAS IN RESPONSE TO THE RAISING OF SAID FIRST UPPER LIQUID LEVEL FOR RESTORING SAID REFRIGERANT TO A PREDETERMINED FIRST UPPER LIQUID LEVEL IN SAID CRYOSTAT.
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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) | 1969-09-12 | 1970-03-14 | 1970-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-12 | 1974-03-14 | 1974-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-12 | 1978-03-14 | 1978-09-13 | $7700.00 | Window Closed / Lapsed |