US3252291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cryo-pumps
Assignee: Bendix Balzers Vacuum Inc
•
Filing: 1963-04-04
•
Granted: 1966-05-24
•
Expires: 1983-04-04
Abstract
No abstract record available.
Inventors
- 👤 Franz X Eder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:07
CPC Classifications
F; F04; F04B; F04B37/00; F04B37/06; F04B37/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
82 words
A METHOD FOR OPERATING A HIGH VACUUM PUMP USING A LIQUIFIED GASEOUS COOLANT TO REMOVE GAS FROM A VESSEL COMPRISING THE STEPS OF EXPANDING A HIGH PRESSURE GASEOUS COOLANT, ADIABATICALLY COOLING SAID COOLANT TO LIQUEFYING TEMPERATURE, CONDENSING THE GAS TO BE REMOVED THROUGH HEAT TRANSFER WITH SAID COOLANT, FORMING A LAYER OF CONDENSED GAS OF PREDETERMINED THICKNESS AND INCREASING THE TEMPERATURE OF THE CONDENSED GAS LAYER TO THE RECRYSTALLIZATION TEMPERATURE OF SAID CONDENSED GAS LAYER, WHEN THE PREDETERMINED THICKNESS HAS BEEN REACHED.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
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 |