US3518839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low temperature fractionation of gaseous mixtures with preliminary and split stream heat exchange
Assignee: Linde GmbH
•
Filing: 1967-03-31
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Granted: 1970-07-07
•
Expires: 1987-03-31
Abstract
No abstract record available.
Inventors
- 👤 Rudolf Becker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:39
CPC Classifications
F; F25; F25J; F25J5/00; Y; Y10; Y10S; Y10S62/00; Y10S62/902; Y10S62/903
Claims Analysis
Total Claims: 0
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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) | 1973-07-06 | 1974-01-05 | 1974-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-06 | 1978-01-05 | 1978-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-06 | 1982-01-05 | 1982-07-07 | $7700.00 | Window Closed / Lapsed |