Patent US3520112A successfully refreshed from Google Patents.
US3520112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Column for selective adsorption of hydrocarbons from mixtures
Assignee: SCHWERMASCH LIEBKNECHT VEB K
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Filing: 1968-07-24
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Granted: 1970-07-14
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Expires: 1988-07-24
Abstract
No abstract record available.
Inventors
- 👤 Manfred Mittelstrass
- 👤 Edgar Kotztin
- 👤 Heinz Salomon
- 👤 Rudolf Ullrich
- 👤 Rolf Tauchnitz
- 👤 Klaus-Dieter Arndt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:40
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2609887A
Cited
US2719206A
Cited
US2639973A
Cited
US2717694A
Cited
US2850114A
Cited
US2921970A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-13 | 1974-01-12 | 1974-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-13 | 1978-01-12 | 1978-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-13 | 1982-01-12 | 1982-07-14 | $7700.00 | Window Closed / Lapsed |