US2500118A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Natural gas liquefaction
Assignee: Individual
•
Filing: 1945-08-18
•
Granted: 1950-03-07
•
Expires: 1965-08-18
Abstract
No abstract record available.
Inventors
- 👤 Howell C Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:12
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/0228; F25J3/0257; C; C07; C07C; C07C7/00; F25J1/00; F25J1/0002; F25J1/0022; F25J1/003; F25J1/0047; F25J1/0052; F25J1/006; F25J1/008; F25J1/0082; F25J1/0085; F25J1/02; F25J1/0203; F25J1/0208; F25J1/0228; F25J1/0235; F25J1/0237; F25J1/0243; F25J1/0257; F25J1/0262; F25J1/0264; F25J1/0265; F25J1/0268; F25J3/0204; F25J3/0209; F25J3/0233; F25J2200/00; F25J2200/02; F25J2200/76; F25J2215/00; F25J2215/04; F25J2270/00; F25J2270/12; F25J2270/42; F25J2270/60; F25J2270/90; Y; Y10; Y10S; Y10S62/00; Y10S62/927
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
IN THE PRODUCTION OF LIQUID METHANE FROM A NATURAL GAS MIXTURE CONTAINING A SUBSTANTIAL AMOUNT OF NITROGEN: LIQUEFYING SAID MIXTURE BY HEAT EXCHANGE WITH A BOILING REFRIGERANT, SEPARATING NITROGEN AS A GAS FROM THE LIQUEFIED SOLUTION BY REDUCTION OF PRESSURE THEREON IN THE PRESENCE OF LIQUID NITROGEN, EMPLOYING PREVIOUSLY SEPARATED AND RELIQUEFIED NITROGEN FOR THE PURPOSE, AND VENTING THE RESULTANT GASEOUS NITROGEN IN EX-
Claim 2
Dependent Claim
64 words
IN THE PRODUCTION OF LIQUID METHANE FROM A NATURAL GAS MIXTURE CONTAINING A SUBSTANTIAL AMOUNT OF NITROGEN: LIQUEFYING SAID MIXTURE BY HEAT EXCHANGE WITH A BOILING REFRIGERANT, SEPARATING NITROGEN AS A GAS FROM THE LIQUEFIED SOLUTION BY REDUCTION OF PRESSURE THEREON IN THE PRESENCE OF LIQUID NITROGEN, EMPLOYING PREVIOUSLY SEPARATED AND RELIQUEFIED NITROGEN FOR THE PURPOSE, AND VENTING THE RESULTANT GASEOUS NITROGEN IN EX-
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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) | 1953-03-06 | 1953-09-05 | 1954-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-06 | 1957-09-05 | 1958-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-06 | 1961-09-05 | 1962-03-07 | $7700.00 | Window Closed / Lapsed |