Patent EP0391660A2 successfully refreshed from Google Patents.
US3401532A
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Hydrogen recovery with a methane freezing point depressant
Assignee: Petrocarbon Developments Ltd
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Filing: 1965-05-13
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Granted: 1968-09-17
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Expires: 1985-05-13
Abstract
No abstract record available.
Inventors
- 👤 Paul L Charlesworth
- 👤 Martin S W Ruhemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:16
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/06; F25J3/0605; F25J3/062; C; C01; C01B; C01B3/00; C01B3/50; C01B3/506; F25J3/063; F25J3/0635; F25J3/0655; C01B2203/00; C01B2203/04; C01B2203/0465; C01B2203/048; F25J2205/00; F25J2205/50; F25J2245/00; F25J2245/02; F25J2270/00; F25J2270/14; F25J2270/42; Y; Y10; Y10S; Y10S62/00; Y10S62/931; Y10S62/932
Claims Analysis
Total Claims: 0
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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) | 1971-09-17 | 1972-03-18 | 1972-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-17 | 1976-03-18 | 1976-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-17 | 1980-03-18 | 1980-09-17 | $7700.00 | Window Closed / Lapsed |