US3243385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of a catalyst containing vanadium and tin oxides
Assignee: Knapsack AG
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Filing: 1964-08-10
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Granted: 1966-03-29
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Expires: 1984-08-10
Abstract
No abstract record available.
Inventors
- 👤 Sennewald Kurt
- 👤 Vogt Wilhelm
- 👤 Ohorodnik Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:16
CPC Classifications
C; C07; C07C; C07C255/00; B; B01; B01J; B01J23/00; B01J23/14; B01J23/16; B01J23/20; B01J23/22; B01J27/00; B01J27/14; B01J27/186; B01J27/195; B01J27/198; B01J37/00; B01J37/08; B01J37/10; C07C253/00; C07C253/24; C07C253/26; B01J21/00; B01J21/06; B01J21/08; B01J37/0009; B01J37/0027; B01J37/0045; B01J37/02; B01J37/0236; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
A PROCESS FOR THE MANUFACTURE OF A CATALYST CONTAINING VANADIUM AND TIN OXIDES, WHICH COMPRISES DISSOLVING TIN IN AN ABOUT 10 TO 40% BY WEIGHT AQUEOUS NITRIC ACID AT A TEMPERATURE NOT EXCEEDING 20*C., INTRODUCING IMMEDIATELY THE RESULTING CLEAR SOLUTION OF TIN-II-NITRATE INTO AN AQUEOUS COLLOIDAL SILICIC ACID SOLUTION CONTAINING 8 TO 20% BY WEIGHT SIO2 AND AMMONIUM VANADATE (NH4VO3), HOMOGENIZING FAIRLY RAPIDLY THE RESULTING SUSPENSION, TREATING THE SAID SUSPENSION IN THE LIQUID PHASE AT A TEMPERATURE OF 80 TO 95*C. AND FOR A PERIOD OF TIME OF 0.5 TO 10 HOURS WITH AQUEOUS AMMONIA, DRYING THE HOMOGENIZED SUSPENSION, CLACINING IT AT A TEMPERATURE OF 400 TO 800*C. WITH THE RESULTING FORMATION OF A CALCINED CATALYST, AND TREATING THE CALCINED CATALYST AT A TEMPERATURE OF 110 TO 500*C. FOR A PERIOD OF TIME OF 1 TO 50 HOURS WITH STEAM AND GASEOUS AMMONIA.
Claim 2
Dependent Claim
143 words
A PROCESS FOR THE MANUFACTURE OF A CATALYST CONTAINING VANADIUM AND TIN OXIDES, WHICH COMPRISES DISSOLVING TIN IN AN ABOUT 10 TO 40% BY WEIGHT AQUEOUS NITRIC ACID AT A TEMPERATURE NOT EXCEEDING 20*C., INTRODUCING IMMEDIATELY THE RESULTING CLEAR SOLUTION OF TIN-II-NITRATE INTO AN AQUEOUS COLLOIDAL SILICIC ACID SOLUTION CONTAINING 8 TO 20% BY WEIGHT SIO2 AND AMMONIUM VANADATE (NH4VO3), HOMOGENIZING FAIRLY RAPIDLY THE RESULTING SUSPENSION, TREATING THE SAID SUSPENSION IN THE LIQUID PHASE AT A TEMPERATURE OF 80 TO 95*C. AND FOR A PERIOD OF TIME OF 0.5 TO 10 HOURS WITH AQUEOUS AMMONIA, DRYING THE HOMOGENIZED SUSPENSION, CLACINING IT AT A TEMPERATURE OF 400 TO 800*C. WITH THE RESULTING FORMATION OF A CALCINED CATALYST, AND TREATING THE CALCINED CATALYST AT A TEMPERATURE OF 110 TO 500*C. FOR A PERIOD OF TIME OF 1 TO 50 HOURS WITH STEAM AND GASEOUS AMMONIA.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-28 | 1969-09-27 | 1970-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-28 | 1973-09-27 | 1974-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-28 | 1977-09-27 | 1978-03-29 | $7700.00 | Window Closed / Lapsed |