US2627731A
Expired / Lapsed
US
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Rectification of gaseous mixtures
Assignee: Hydrocarbon Research Inc
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Filing: 1949-06-18
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Granted: 1953-02-10
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Expires: 1969-06-18
Abstract
No abstract record available.
Inventors
- 👤 Benedict Manson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:19
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/044; F25J3/0204; F25J3/0209; F25J3/0228; F25J3/0257; F25J3/04151; F25J3/04163; F25J3/04187; F25J3/04218; F25J3/04224; F25J3/04248; F25J3/04254; F25J3/0426; F25J3/04266; F25J3/04278; F25J3/04333; F25J3/04351; F25J3/04357; F25J3/04763; F25J3/04866; F25J3/04872; F25J3/04884; F25J2200/00; F25J2200/02; F25J2200/40; F25J2200/50; F25J2200/76; F25J2270/00; F25J2270/04; F25J2270/88; F25J2290/00; F25J2290/12
Claims Analysis
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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) | 1956-02-10 | 1956-08-11 | 1957-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-10 | 1960-08-11 | 1961-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-10 | 1964-08-11 | 1965-02-10 | $7700.00 | Window Closed / Lapsed |