US3801513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon containing molecular sieves
Assignee: Bergwerksverband GmbH
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Filing: 1971-07-09
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Granted: 1974-04-02
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Expires: 1991-07-09
Abstract
Abstract PROCESS FOR PREPARING CARBON CONTAINING MOLECULAR SIEVES ADAPTED FOR SEPARATING SMALL MOLECULAR GASES IN PARTICULAR OXYGEN FROM NITROGEN WHICH COMPRISES TREATING COKE HAVING A CONTENT OF VOLATILE COMPONENTS OF UP TO 5% AT 600-900* C. WITH A CARBONACEOUS SUBSTANCE WHICH SPLITS OFF CARBON WHEREBY THE SPLIT-OFF CARBON IS DEPOSITED IN THE CARBON FRAMEWORK OF THE COKE UNDER NARROWING OF THE EXISTING PORES.
Inventors
- 👤 H Muenzner
- 👤 H Heimbach
- 👤 D Zuendorf
- 👤 H Juentgen
- 👤 K Knoblauch
- 👤 W Koerbaecher
- 👤 W Peters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:46
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; C; C01; C01B; C01B32/00; C01B32/30; C01B32/306; C01B2210/00; C01B2210/0043; C01B2210/0045
Claims Analysis
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References Cited (Backward Citations)
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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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |