US3144199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of evacuating treating chambers
Assignee: ISEN IND Inc
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Filing: 1961-07-20
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Granted: 1964-08-11
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Expires: 1981-07-20
Abstract
No abstract record available.
Inventors
- 👤 Harold N Ipsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:43
CPC Classifications
F; F04; F04F; F04F9/00; F04F9/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
166 words
THE METHOD OF REPEATEDLY EVACUATING A CHAMBER USING A MECHANICAL PUMP AND AN OIL DIFFUSION VAPOR PUMP IN THE LATTER OF WHICH OIL IS HEATED TO VAPORIZE AND THE OIL VAPOR ISSUES IN JET STREAMS TO IMPEL GAS MOLECULES AWAY FROM THE CHAMBER, SAID PUMPS BEING CONNECTED IN SERIES WITH THE DIFFUSION PUMP COMMUNICATING DIRECTLY WITH THE CHAMBER, SAID METHOD COMPRISING THE STEPS OF INITIATING OPERATION OF SAID MECHANICAL PUMP TO DRAW GAS OUT OF THE CHAMBER THROUGH SAID OIL DIFFUSION VAPOR PUMP WHILE THE TEMPERATURE OF THE OIL IS SUBSTANTIALLY BELOW ITS BOILING POINT, SIMULTANEOUSLY HEATING THE OIL IN SAID VAPOR PUMP WHEREBY INITIAL EVACUATION OF THE CHAMBER IS EFFECTED BY THE MECHANICAL PUMP THROUGH THE DIFFUSION PUMP UNTIL THE OIL BEGINS TO VAPORIZE AND THEREAFTER THE VAPOR PUMP ASSISTS THE MECHANICAL PUMP IN THE FINAL EVACUATION OF THE CHAMBER, AND THEN COOLING THE OIL TO A TEMPERATURE SUBSTANTIALLY BELOW ITS BOILING POINT BEFORE AGAIN INITIATING OPERATION OF SAID MECHANICAL PUMP TO REEVACUATE SAID CHAMBER.
Claim 2
Independent Claim
166 words
THE METHOD OF REPEATEDLY EVACUATING A CHAMBER USING A MECHANICAL PUMP AND AN OIL DIFFUSION VAPOR PUMP IN THE LATTER OF WHICH OIL IS HEATED TO VAPORIZE AND THE OIL VAPOR ISSUES IN JET STREAMS TO IMPEL GAS MOLECULES AWAY FROM THE CHAMBER, SAID PUMPS BEING CONNECTED IN SERIES WITH THE DIFFUSION PUMP COMMUNICATING DIRECTLY WITH THE CHAMBER, SAID METHOD COMPRISING THE STEPS OF INITIATING OPERATION OF SAID MECHANICAL PUMP TO DRAW GAS OUT OF THE CHAMBER THROUGH SAID OIL DIFFUSION VAPOR PUMP WHILE THE TEMPERATURE OF THE OIL IS SUBSTANTIALLY BELOW ITS BOILING POINT, SIMULTANEOUSLY HEATING THE OIL IN SAID VAPOR PUMP WHEREBY INITIAL EVACUATION OF THE CHAMBER IS EFFECTED BY THE MECHANICAL PUMP THROUGH THE DIFFUSION PUMP UNTIL THE OIL BEGINS TO VAPORIZE AND THEREAFTER THE VAPOR PUMP ASSISTS THE MECHANICAL PUMP IN THE FINAL EVACUATION OF THE CHAMBER, AND THEN COOLING THE OIL TO A TEMPERATURE SUBSTANTIALLY BELOW ITS BOILING POINT BEFORE AGAIN INITIATING OPERATION OF SAID MECHANICAL PUMP TO REEVACUATE SAID CHAMBER.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-11 | 1968-02-10 | 1968-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-11 | 1972-02-10 | 1972-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-11 | 1976-02-10 | 1976-08-11 | $7700.00 | Window Closed / Lapsed |