Patent US2899379A successfully refreshed from Google Patents.
US2899379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Desorption of zeolitic molecular sieves using ammonia
Assignee: —
•
Filing: —
•
Granted: 1959-08-11
•
Expires: 1976-08-11
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:03
CPC Classifications
C; C10; C10G; C10G25/00; C10G25/02; C10G25/03; B; B01; B01J; B01J20/00; B01J20/30; B01J20/34; B01J20/3408
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
97 words
AN IMPROVED PROCESS FOR UPGRADING NAPHTHAS PRODUCED BY THE CATALYTIC HYDROFORMING OF VIRGIN NAPHTHAS, WHICH COMPRISES PASSING VAPORIZED HYDROFORMATE INTO A ZEOLITIC MOLECULAR SIEVE ADSORPTION ZONE, MAINTAINING A TEMPERATURE IN SAID ZONE BELOW ABOUT 600*F., ABSORBING STRAIGHT CHAIN HYDROCARBONS FROM SAID FEED, WITHDRAWING AN UPGRADED HIGHER OCTANE RATING NAPHTHA DEPLETED IN STRAIGHT CHAIN HYDROCARBONS FROM SAID ZONE, DESORBING SAID STRAIGHT CHAIN HYDROCARBONS FROM SAID SIEVES IN SAID ZONE WITH GASEOUS AMMONIA AT A TEMPERATURE LESS THAN ABOUT 600*F., AND THEREAFTER PASSING AN INERT PURGE GAS HEATED TO A TEMPERATURE ABOVE 600*F. TO STRIP AMMONIA FROM SAID ZONE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-10 | 1963-02-09 | 1963-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-10 | 1967-02-09 | 1967-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-10 | 1971-02-09 | 1971-08-11 | $7700.00 | Window Closed / Lapsed |