US3338061A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-temperature fractionation process
Assignee: Air Products and Chemicals Inc
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Filing: 1964-08-12
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Granted: 1967-08-29
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Expires: 1984-08-12
Abstract
No abstract record available.
Inventors
- 👤 Leonard J Hvizdos
- 👤 John A Pryor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:47
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04248; F25J3/04284; F25J3/04309; F25J3/04151; F25J3/04187; F25J3/04193; F25J3/04206; F25J3/04212; F25J3/04278; F25J3/04406; F25J3/04412; F25J2200/00; F25J2200/32; F25J2200/34; F25J2205/00; F25J2205/02; F25J2250/00; F25J2250/30; F25J2250/42; F25J2250/50; F25J2270/00; F25J2270/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
A PROCESS FOR THE LOW-TEMPERATURE SEPARATION OF A NORMALLY GASEOUS MIXTURE INTO AT LEAST ONE ENRICHED HIGH BOILING FRACTION AND AT LEAST ONE ENRICHED LOW BOILING FRACTION, WHICH PROCESS COMPRISES THE STEPS OF: (A) FRACTIONATING THE GASEOUS MIXTURE IN A MAIN HIGH PRESSURE SEPARATION ZONE TO OBTAIN AN OVERHEAD FRACTION AND A BOTTOMS FRACTION; (B) PASSING SAID BOTTOMS FRACTION AS FEED TO A MAIN LOW PRESSURE SEPARATION ZONE TO OBTAIN OVERHEAD VAPOR AND AN ENRICHED HIGH BOILING BOTTOMS FRACTION; (C) PASSING A PORTION OF SAID OVERHEAD FRACTION TO AN AUXILIARY HIGH PRESSURE FRACTIONATION ZONE POSITIONED AWAY FROM THE MAIN HIGH PRESSURE SEPARATION ZONE AND FRACTIONATING SAID OVERHEAD FRACTION TO PRODUCE AN ENRICHED LOW BOILING OVERHEAD; AND (D) PASSING AT LEAST A PORTION OF SAID ENRICHED LOW BOILING OVERHEAD IN HEAT EXCHANGE RELATIONSHIP WITH ENRICHED HIGH BOILING BOTTOMS FRACTION WITHDRAWN
Claim 2
Dependent Claim
139 words
A PROCESS FOR THE LOW-TEMPERATURE SEPARATION OF A NORMALLY GASEOUS MIXTURE INTO AT LEAST ONE ENRICHED HIGH BOILING FRACTION AND AT LEAST ONE ENRICHED LOW BOILING FRACTION, WHICH PROCESS COMPRISES THE STEPS OF: (A) FRACTIONATING THE GASEOUS MIXTURE IN A MAIN HIGH PRESSURE SEPARATION ZONE TO OBTAIN AN OVERHEAD FRACTION AND A BOTTOMS FRACTION; (B) PASSING SAID BOTTOMS FRACTION AS FEED TO A MAIN LOW PRESSURE SEPARATION ZONE TO OBTAIN OVERHEAD VAPOR AND AN ENRICHED HIGH BOILING BOTTOMS FRACTION; (C) PASSING A PORTION OF SAID OVERHEAD FRACTION TO AN AUXILIARY HIGH PRESSURE FRACTIONATION ZONE POSITIONED AWAY FROM THE MAIN HIGH PRESSURE SEPARATION ZONE AND FRACTIONATING SAID OVERHEAD FRACTION TO PRODUCE AN ENRICHED LOW BOILING OVERHEAD; AND (D) PASSING AT LEAST A PORTION OF SAID ENRICHED LOW BOILING OVERHEAD IN HEAT EXCHANGE RELATIONSHIP WITH ENRICHED HIGH BOILING BOTTOMS FRACTION WITHDRAWN
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) | 1970-08-28 | 1971-02-27 | 1971-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-28 | 1975-02-27 | 1975-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-28 | 1979-02-27 | 1979-08-29 | $7700.00 | Window Closed / Lapsed |