US2993010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Activation of dehydration catalysts
Assignee: Lonza Electric and Chemical Works Ltd
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Filing: 1957-06-28
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Granted: 1961-07-18
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Expires: 1977-06-28
Abstract
No abstract record available.
Inventors
- 👤 Guyer August
- 👤 Guyer Pio
- 👤 Walther Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:31
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/14; B01J27/16; B01J27/18; B01J27/1802; C; C07; C07C; C07C253/00; C07C253/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A METHOD OF ACTIVATING PHOSPHATE DEHYDRATION CATALYSTS USED IN THE PREPARATION OF NITRILES OF ALIPHATIC CARBOXYLIC ACIDS SELECTED FROM THE GROUP CONSISTING OF BORON PHOSPHATE, CADMIUM PHOSPHATE, MAGNESIUM PHOSPHATE, AND ALUMINUM PHOSPHATE COMPRISING DRYING THE WATER CONTAINING CATALYSTS AT A TEMPERATURE OF ABOUT 100 TO 120*C. TO A CHEMICALLY BOUND WATER CONTENT OF 1 TO 2 MOLES PER MOLE OF PHOSPHATE, SUBSEQUENTLY SUBSTANTIALLY REMOVING SAID CHEMICALLY BOUND WATER AND HEATING THE PHOSPHATE IN AMMONIA AT TEMPERATURES OF ABOUT 200550*C., THEREBY PRODUCTING INDIVIDUAL AMMONIUM PHOSPHATE CRYSTALLITIES ON THE SURFACE OF THE CATALYST.
Claim 2
Independent Claim
91 words
A METHOD OF ACTIVATING PHOSPHATE DEHYDRATION CATALYSTS USED IN THE PREPARATION OF NITRILES OF ALIPHATIC CARBOXYLIC ACIDS SELECTED FROM THE GROUP CONSISTING OF BORON PHOSPHATE, CADMIUM PHOSPHATE, MAGNESIUM PHOSPHATE, AND ALUMINUM PHOSPHATE COMPRISING DRYING THE WATER CONTAINING CATALYSTS AT A TEMPERATURE OF ABOUT 100 TO 120*C. TO A CHEMICALLY BOUND WATER CONTENT OF 1 TO 2 MOLES PER MOLE OF PHOSPHATE, SUBSEQUENTLY SUBSTANTIALLY REMOVING SAID CHEMICALLY BOUND WATER AND HEATING THE PHOSPHATE IN AMMONIA AT TEMPERATURES OF ABOUT 200550*C., THEREBY PRODUCTING INDIVIDUAL AMMONIUM PHOSPHATE CRYSTALLITIES ON THE SURFACE OF THE CATALYST.
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) | 1964-07-17 | 1965-01-16 | 1965-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-17 | 1969-01-16 | 1969-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-17 | 1973-01-16 | 1973-07-18 | $7700.00 | Window Closed / Lapsed |