Patent US3344166A successfully refreshed from Google Patents.
US3344166A
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Preparation of malonic acid dinitrile
Assignee: Lonza AG
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Filing: 1964-12-16
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Granted: 1967-09-26
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Expires: 1984-12-16
Abstract
No abstract record available.
Inventors
- 👤 Zinsstag Christoph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:12
CPC Classifications
C; C07; C07C; C07C255/00; B; B01; B01J; B01J27/00; B01J27/14; B01J27/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
A PROCESS FOR THE PREPARATION OF MALONIC ADIC DINITRILE WHICH COMPRISES PASSING GASEOUS CYANOACETAMIDE AT A PRESSURE OF 0.5 TO 100 MM. HG AT A TEMPERATURE IN THE RANGE OF 250 TO 450*C. OVER A CATALYST WHICH CONSISTS ESSENTIALLY OF POLYPHOSPHORIC ACID PRODUCED BY THERMAL DECOMPOSITION OF ORTHOPHOSPHORIC ACID AND AN ACIDIC TO NEUTRAL CARRIER SELECTED FROM THE GROUP CONSISTING OF ACTIVATED CARBON, SILICA MATERIALS, AND BORIC OXIDE.
Claim 2
Dependent Claim
68 words
A PROCESS FOR THE PREPARATION OF MALONIC ADIC DINITRILE WHICH COMPRISES PASSING GASEOUS CYANOACETAMIDE AT A PRESSURE OF 0.5 TO 100 MM. HG AT A TEMPERATURE IN THE RANGE OF 250 TO 450*C. OVER A CATALYST WHICH CONSISTS ESSENTIALLY OF POLYPHOSPHORIC ACID PRODUCED BY THERMAL DECOMPOSITION OF ORTHOPHOSPHORIC ACID AND AN ACIDIC TO NEUTRAL CARRIER SELECTED FROM THE GROUP CONSISTING OF ACTIVATED CARBON, SILICA MATERIALS, AND BORIC OXIDE.
References Cited (Backward Citations)
US3277146A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-25 | 1971-03-27 | 1971-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-25 | 1975-03-27 | 1975-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-25 | 1979-03-27 | 1979-09-26 | $7700.00 | Window Closed / Lapsed |