US2993342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of rare gases from synthetic ammonia plant purge gases
Assignee: Phillips Petroleum Co
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Filing: 1957-03-29
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Granted: 1961-07-25
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Expires: 1977-03-29
Abstract
No abstract record available.
Inventors
- 👤 Robert A Koble
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:06
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/0204; F25J3/0219; C; C01; C01C; C01C1/00; C01C1/02; C01C1/04; C01C1/0405; C01C1/0476; F25J3/0228; F25J3/0233; F25J3/0276; F25J3/028; F25J3/0285; F25J3/029; F25J3/04; F25J3/04006; F25J3/04012; F25J3/04018; F25J3/04109; F25J3/04115; F25J3/04248; F25J3/04284; F25J3/04309; F25J3/044; F25J3/04521; F25J3/04563; F25J3/04587; F25J2200/00; F25J2200/74; F25J2205/00; F25J2205/02; F25J2205/04; F25J2205/40; F25J2205/82; F25J2210/00; F25J2210/20; F25J2210/40; F25J2210/42; F25J2215/00; F25J2215/02; F25J2240/00; F25J2240/02; F25J2240/30; F25J2270/00; F25J2270/04; F25J2270/06; F25J2270/90; F25J2270/904; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52; Y10; Y10S; Y10S62/00; Y10S62/931; Y10S62/934
Claims Analysis
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References Cited (Backward Citations)
US1658631A
Cited
US2019632A
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US2530602A
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US2545778A
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US2826480A
Cited
US2713781A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-24 | 1965-01-23 | 1965-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-24 | 1969-01-23 | 1969-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-24 | 1973-01-23 | 1973-07-25 | $7700.00 | Window Closed / Lapsed |