US2522787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for liquefying gases
Assignee: Phillips Petroleum Co
•
Filing: 1948-06-11
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Granted: 1950-09-19
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Expires: 1968-06-11
Abstract
No abstract record available.
Inventors
- 👤 Darrel W Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:05
CPC Classifications
F; F25; F25J; F25J1/00; F25J1/02; F25J1/0243; F25J1/0257; F25J1/0262; F25J1/0264; F25J1/003; F25J1/0032; F25J1/004; F25J1/0201; F25J1/0202; F25J1/0203; F25J1/0208; F25B; F25B9/00; F25B9/02; F25B9/04; F25J2205/00; F25J2205/10; F25J2210/00; F25J2210/06; F25J2270/00; F25J2270/90; Y; Y10; Y10S; Y10S62/00; Y10S62/902; Y10S62/91
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1901389A
Cited
US1952281A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-18 | 1954-03-20 | 1954-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-18 | 1958-03-20 | 1958-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-18 | 1962-03-20 | 1962-09-19 | $7700.00 | Window Closed / Lapsed |