Patent US3407614A successfully refreshed from Google Patents.
US3407614A
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Helium purification
Assignee: Phillips Petroleum Co
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Filing: 1966-12-19
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Granted: 1968-10-29
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Expires: 1986-12-19
Abstract
No abstract record available.
Inventors
- 👤 Forrest L Poska
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:18
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/0228; F25J3/028; F25J3/029; F25J3/0257; F25J2205/00; F25J2205/02; F25J2205/60; F25J2205/82; F25J2210/00; F25J2210/04; F25J2245/00; F25J2245/02; F25J2270/00; F25J2270/42; F25J2270/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2895303A
Cited
US2973834A
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US3026682A
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US3205669A
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US3254496A
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US3339371A
Cited
US3293869A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-29 | 1972-04-29 | 1972-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-29 | 1976-04-29 | 1976-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-29 | 1980-04-29 | 1980-10-29 | $7700.00 | Window Closed / Lapsed |