Patent US3261168A successfully refreshed from Google Patents.
US3261168A
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Separation of oxygen from air
Assignee: Petrocarbon Developments Ltd
•
Filing: 1962-11-02
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Granted: 1966-07-19
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Expires: 1982-11-02
Abstract
No abstract record available.
Inventors
- 👤 Ruhemann Martin Siegfr William
- 👤 Yale Barbara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:18
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/044; F25J3/04248; F25J3/04284; F25J3/0429; F25J3/04309; F25J3/04375; F25J3/04393; F25J2245/00; F25J2245/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
A PROCESS FOR SEPARATING LIQUID OXYGEN FROM AIR BY LOW TEMPERATURE FRACTIONATION IN A SINGLE FRACTIONATION COLUMN COMPRISING: (A) SUPPLYING A FEED AIR STREAM AT A RELATIVELY LOW SUPER-ATMOSPHERIC PRESSURE; INCLUDING, A FIRST PART OF
Claim 2
Dependent Claim
35 words
A PROCESS FOR SEPARATING LIQUID OXYGEN FROM AIR BY LOW TEMPERATURE FRACTIONATION IN A SINGLE FRACTIONATION COLUMN COMPRISING: (A) SUPPLYING A FEED AIR STREAM AT A RELATIVELY LOW SUPER-ATMOSPHERIC PRESSURE; INCLUDING, A FIRST PART OF
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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) | 1969-07-18 | 1970-01-17 | 1970-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-18 | 1974-01-17 | 1974-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-18 | 1978-01-17 | 1978-07-19 | $7700.00 | Window Closed / Lapsed |