US3085739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum method
Assignee: International Business Machines Corp
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Filing: 1960-09-20
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Granted: 1963-04-16
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Expires: 1980-09-20
Abstract
No abstract record available.
Inventors
- 👤 Ames Irving
- 👤 Robert L Christensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:10
CPC Classifications
H; H01; H01J; H01J41/00; H01J41/12; H01J9/00; H01J9/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
183 words
THE METHOD OF ATTAINING AND MAINTAINING AN ULTRA HIGH VACUUM WITHIN A VACUUM SYSTEM WITHOUT EMPLOYING A HIGH TEMPERATURE BAKEOUT COMPRISING THE STEPS OF; REDUCING THE PRESSURE WITHIN SAID SYSTEM WITH AN ULTRA HIGH VACUUM PUMP UNTIL A FIRST LIMITING PRESSURE IS ATTAINED; SAID FIRST LIMITING PRESSURE BEING DETERMINED BY THE PUMPING SPEED OF SAID PUMP AND THE NUMBER OF GAS MOLECULES DESORBING FROM THE INTERIOR SURFACES OF SAID SYSTEM; INTRODUCING A FLOW OF HYDROGEN AT A PREDETERMINED PRESSURE INTO SAID SYSTEM; IONIZING A PORTION OF SAID HYDROGEN, SAID HYDROGEN IONS BEING THEREAFTER EFFECTIVE TO INCREASE THE RATE OF DESORPTION OF GAS MOLECULES FROM SAID SURFACES OF SAID SYSTEMS; REDUCING THE PARTIAL PRESSURE OF EACH OF SAID GAS MOLECULES TO A SECOND LIMITING PRESSURE LESS THAN SAID FIRST LIMITING PRESSURE BY SAID ULTRA HIGH VACUUM PUMP; TERMINATING SAID FLOW OF HYDROGEN; AND FURTHER REDUCING THE TOTAL PRESSURE WITHIN SAID SYSTEM TO SAID SECOND LIMITING PRESSURE BY SAID ULTRA HIGH VACUUM PUMP TO THEREBY ATTAIN AN ULTRA HIGH VACUUM, SAID ULTRA HIGH VACUUM PUMP, OF AND BY ITSELF, THEREAFTER MAINTAINING SAID ULTRA HIGH VACUUM.
Claim 2
Independent Claim
183 words
THE METHOD OF ATTAINING AND MAINTAINING AN ULTRA HIGH VACUUM WITHIN A VACUUM SYSTEM WITHOUT EMPLOYING A HIGH TEMPERATURE BAKEOUT COMPRISING THE STEPS OF; REDUCING THE PRESSURE WITHIN SAID SYSTEM WITH AN ULTRA HIGH VACUUM PUMP UNTIL A FIRST LIMITING PRESSURE IS ATTAINED; SAID FIRST LIMITING PRESSURE BEING DETERMINED BY THE PUMPING SPEED OF SAID PUMP AND THE NUMBER OF GAS MOLECULES DESORBING FROM THE INTERIOR SURFACES OF SAID SYSTEM; INTRODUCING A FLOW OF HYDROGEN AT A PREDETERMINED PRESSURE INTO SAID SYSTEM; IONIZING A PORTION OF SAID HYDROGEN, SAID HYDROGEN IONS BEING THEREAFTER EFFECTIVE TO INCREASE THE RATE OF DESORPTION OF GAS MOLECULES FROM SAID SURFACES OF SAID SYSTEMS; REDUCING THE PARTIAL PRESSURE OF EACH OF SAID GAS MOLECULES TO A SECOND LIMITING PRESSURE LESS THAN SAID FIRST LIMITING PRESSURE BY SAID ULTRA HIGH VACUUM PUMP; TERMINATING SAID FLOW OF HYDROGEN; AND FURTHER REDUCING THE TOTAL PRESSURE WITHIN SAID SYSTEM TO SAID SECOND LIMITING PRESSURE BY SAID ULTRA HIGH VACUUM PUMP TO THEREBY ATTAIN AN ULTRA HIGH VACUUM, SAID ULTRA HIGH VACUUM PUMP, OF AND BY ITSELF, THEREAFTER MAINTAINING SAID ULTRA HIGH VACUUM.
References Cited (Backward Citations)
US1651386A
Cited
US2858972A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-04-15 | 1966-10-15 | 1967-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-15 | 1970-10-15 | 1971-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-15 | 1974-10-15 | 1975-04-16 | $7700.00 | Window Closed / Lapsed |