US3323316A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nitrogen recovery from a gaseous mixture
Assignee: Conch International Methane Ltd
•
Filing: 1964-04-21
•
Granted: 1967-06-06
•
Expires: 1984-04-21
Abstract
No abstract record available.
Inventors
- 👤 Harmens Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:52
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/0228; F25J3/0257; F17; F17C; F17C9/00; F17C9/02; F17C9/04; F25J3/0204; F25J3/0209; F25J3/0233; F17C2201/00; F17C2201/01; F17C2201/0104; F17C2201/0109; F17C2205/00; F17C2205/03; F17C2205/0302; F17C2205/0323; F17C2221/00; F17C2221/01; F17C2221/014; F17C2221/03; F17C2221/032; F17C2221/033; F17C2223/00; F17C2223/01; F17C2223/0146; F17C2223/0153; F17C2223/0161; F17C2227/00; F17C2227/03; F17C2227/0337; F17C2227/0367; F17C2227/0388; F17C2227/0393; F17C2265/00; F17C2265/01; F17C2265/015; F25J2200/00; F25J2200/02; F25J2200/50; F25J2210/00; F25J2210/62; F25J2215/00; F25J2215/04; F25J2230/00; F25J2230/60; F25J2235/00; F25J2235/60; F25J2245/00; F25J2245/02; F25J2270/00; F25J2270/02; F25J2270/90; F25J2270/904; Y; Y10; Y10S; Y10S62/00; Y10S62/927
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
A METHOD OF SEPARATING NITROGEN FROM A NITROGEN RICH FEED GAS TO GIVE A PRODUCT GAS LEAN IN NITROGEN, COMPRISING: (A) LIQUEFYING THE NITROGEN RICH FEED GAS; (B) FRACTIONALLY DISTILLING THE LIQUEFIED FEED GAS FROM STEP (A) INA DISTILLATION COLUMN TO GIVE (1) A TOP GAS COMPRISING GASEOUS NITROGEN AND
Claim 2
Independent Claim
50 words
A METHOD OF SEPARATING NITROGEN FROM A NITROGEN RICH FEED GAS TO GIVE A PRODUCT GAS LEAN IN NITROGEN, COMPRISING: (A) LIQUEFYING THE NITROGEN RICH FEED GAS; (B) FRACTIONALLY DISTILLING THE LIQUEFIED FEED GAS FROM STEP (A) INA DISTILLATION COLUMN TO GIVE (1) A TOP GAS COMPRISING GASEOUS NITROGEN AND
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) | 1970-06-05 | 1970-12-05 | 1971-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-05 | 1974-12-05 | 1975-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-05 | 1978-12-05 | 1979-06-06 | $7700.00 | Window Closed / Lapsed |