Patent US3490246A successfully refreshed from Google Patents.
US3490246A
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Split pressure low temperature process for the production of gases of moderate purity
Assignee: Linde GmbH
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Filing: 1966-08-18
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Granted: 1970-01-20
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Expires: 1986-08-18
Abstract
No abstract record available.
Inventors
- 👤 Rudolf Becker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:14
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04406; F25J3/04412; F25J3/04151; F25J3/04187; F25J3/04193; F25J3/04206; F25J3/04212; F25J3/04248; F25J3/04284; F25J3/0429; F25J3/04303; F25J3/04309; F25J3/04315; F25J3/044; F25J3/04436; F25J3/04448; F25J2200/00; F25J2200/32; F25J2200/70; F25J2205/00; F25J2205/24; F25J2205/30; F25J2250/00; F25J2250/30; F25J2250/42; F25J2250/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US3214925A
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US3261168A
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US3257814A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-19 | 1973-07-21 | 1974-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-19 | 1977-07-21 | 1978-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-19 | 1981-07-21 | 1982-01-20 | $7700.00 | Window Closed / Lapsed |