Patent US3494751A successfully refreshed from Google Patents.
US3494751A
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Process for the fractionation of natural gas
Assignee: Messer Griesheim GmbH
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Filing: 1967-01-17
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Granted: 1970-02-10
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Expires: 1987-01-17
Abstract
No abstract record available.
Inventors
- 👤 Martin Friedrich Wilhe Streich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:41
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/0228; F25J3/0238; C; C07; C07C; C07C7/00; C07C7/04; C10; C10G; C10G5/00; C10G5/06; F25J3/0204; F25J3/0209; F25J3/0233; F25J2200/00; F25J2200/04; F25J2200/70; F25J2200/74; F25J2240/00; F25J2240/02; F25J2270/00; F25J2270/02; F25J2270/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2658360A
Cited
US2557171A
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US2712730A
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US2771149A
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US3057706A
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US3241933A
Cited
US3331214A
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US3407052A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-09 | 1973-08-11 | 1974-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-09 | 1977-08-11 | 1978-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-09 | 1981-08-11 | 1982-02-10 | $7700.00 | Window Closed / Lapsed |