US3237419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and device for attaining very low pressure
Assignee: US Philips Corp
•
Filing: 1964-01-31
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Granted: 1966-03-01
•
Expires: 1984-01-31
Abstract
No abstract record available.
Inventors
- 👤 Venema Albertus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:46
CPC Classifications
F; F04; F04F; F04F9/00; F04F9/04; F04B; F04B37/00; F04B37/06; F04B37/08; F25; F25B; F25B9/00; F25B9/002; F25B9/004
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A METHOD OF ATTAINING VERY LOW PRESSURES WHILE COOLING AN ENCLOSED SPACE TO BE DEGASSED AND UTILIZING A COLD GAS REFRIGERATOR HAVING AN EXPANSION SPACE COMPRISING PLACING SAID ENCLOSED SPACE IN THERMAL CONTACT WITH SAID EXPANSION SPACE OF SAID COLD GAS REFRIGERATOR, DEGASSING SAID ENCLOSED SPACE TO ABOUT 10-9 TORR. AT A LOW TEMPERATURE IN THE ORDER OF 80* K. TO 15* K. TRANSMITTED BY SAID EXPANSION SPACE TO SAID ENCLOSED SPACE WHEN SAID COLD GAS REFRIGERATOR IS OPERATIVE, PROVIDING A CHAMBER SURROUNDING SAID ENCLOSED SPACE, AND DEGASSSING SAID CHAMBER TO ABOUT 10-4 TORR.
Claim 2
Independent Claim
94 words
A METHOD OF ATTAINING VERY LOW PRESSURES WHILE COOLING AN ENCLOSED SPACE TO BE DEGASSED AND UTILIZING A COLD GAS REFRIGERATOR HAVING AN EXPANSION SPACE COMPRISING PLACING SAID ENCLOSED SPACE IN THERMAL CONTACT WITH SAID EXPANSION SPACE OF SAID COLD GAS REFRIGERATOR, DEGASSING SAID ENCLOSED SPACE TO ABOUT 10-9 TORR. AT A LOW TEMPERATURE IN THE ORDER OF 80* K. TO 15* K. TRANSMITTED BY SAID EXPANSION SPACE TO SAID ENCLOSED SPACE WHEN SAID COLD GAS REFRIGERATOR IS OPERATIVE, PROVIDING A CHAMBER SURROUNDING SAID ENCLOSED SPACE, AND DEGASSSING SAID CHAMBER TO ABOUT 10-4 TORR.
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) | 1969-02-28 | 1969-08-30 | 1970-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-28 | 1973-08-30 | 1974-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-28 | 1977-08-30 | 1978-03-01 | $7700.00 | Window Closed / Lapsed |