US3280574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High pressure pure gas for preventing contamination by low pressure raw gas in reversing regenerators
Assignee: Linde GmbH
•
Filing: 1961-10-12
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Granted: 1966-10-25
•
Expires: 1981-10-12
Abstract
No abstract record available.
Inventors
- 👤 Becker Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:21
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04248; F25J3/04375; F25J3/04393; F25J3/04006; F25J3/04048; F25J3/0406; F25J3/04078; F25J3/0409; F25J3/04151; F25J3/04187; F25J3/04218; F25J3/04224; F25J3/04284; F25J3/0429; F25J3/04296; F25J3/04303; F25J3/04309; F25J3/04333; F25J3/04351; F25J3/04357; F25J3/04406; F25J3/04412; F25J3/0443; F25J3/04436; F25J3/04442; F25J2205/00; F25J2205/24; F25J2205/30; F25J2210/00; F25J2210/04; F25J2215/00; F25J2215/42; F25J2215/44; F25J2235/00; F25J2235/42; F25J2245/00; F25J2245/42; F25J2245/50; Y; Y10; Y10S; Y10S62/00; Y10S62/902; Y10S62/909
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
169 words
A PROCESS FOR PRODUCING NITROGEN OF A HIGH PURITY IN A LOW TEMPERATURE AIR SEPARATION INSTALLATION COMPRISING A TWO STAGE AND A ONE STAGE RECTIFICATION COLUMN WHEREIN REVERSIBLE HEAT EXCHANGERS ARE USED FOR THE HEAT EXCHANGE BETWEEN SAID NITROGEN AND INCOMING AIR, AND COMPRISING THE STEPS OF MAINTAINING THE PRESSURE OF SAID ONE STAGE RECTIFICATION COLUMN HIGHER THAN A HIGH PRESSURE COLUMN OF SAID TWO STAGE RECTIFICATION COLUMN, PUMPING LIQUID NITROGEN PRODUCED IN SAID HIGH PRESSURE COLUMN OF SAID TOW STAGE RECTIFICATION COLUMN INTO THE HEAD OF SAID ONE STAGE RECTIFICATION COLUMN, EXPANDING THE SUMP LIQUID NITROGEN PRODUCED IN SAID ONE STAGE RECTIFICATION COLUMN AND SAID HIGH PRESSURE COLUMN OF SAID TWO STAGE RECTIFICATION COLUMN AND INTRODUCING THESE SUMP LIQUIDS INTO SAID HEAD OF SAID LOW PRESSURE COLUMN OF SAID TWO STAGE RECTIFICATION COLUMN, AND PASSING AT LEAST A PORTION OF SAID NITROGEN PRODUCED IN SAID ONE STAGE RECTIFICATION COLUMN IN HEAT EXCHANGE RELATIONSHIP WITH SAID INCOMING AIR AT A PRESSURE GREATER THAN THE PRESSURE OF SAID INCOMING AIR.
Claim 2
Dependent Claim
169 words
A PROCESS FOR PRODUCING NITROGEN OF A HIGH PURITY IN A LOW TEMPERATURE AIR SEPARATION INSTALLATION COMPRISING A TWO STAGE AND A ONE STAGE RECTIFICATION COLUMN WHEREIN REVERSIBLE HEAT EXCHANGERS ARE USED FOR THE HEAT EXCHANGE BETWEEN SAID NITROGEN AND INCOMING AIR, AND COMPRISING THE STEPS OF MAINTAINING THE PRESSURE OF SAID ONE STAGE RECTIFICATION COLUMN HIGHER THAN A HIGH PRESSURE COLUMN OF SAID TWO STAGE RECTIFICATION COLUMN, PUMPING LIQUID NITROGEN PRODUCED IN SAID HIGH PRESSURE COLUMN OF SAID TOW STAGE RECTIFICATION COLUMN INTO THE HEAD OF SAID ONE STAGE RECTIFICATION COLUMN, EXPANDING THE SUMP LIQUID NITROGEN PRODUCED IN SAID ONE STAGE RECTIFICATION COLUMN AND SAID HIGH PRESSURE COLUMN OF SAID TWO STAGE RECTIFICATION COLUMN AND INTRODUCING THESE SUMP LIQUIDS INTO SAID HEAD OF SAID LOW PRESSURE COLUMN OF SAID TWO STAGE RECTIFICATION COLUMN, AND PASSING AT LEAST A PORTION OF SAID NITROGEN PRODUCED IN SAID ONE STAGE RECTIFICATION COLUMN IN HEAT EXCHANGE RELATIONSHIP WITH SAID INCOMING AIR AT A PRESSURE GREATER THAN THE PRESSURE OF SAID INCOMING AIR.
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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) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |