Patent US2779781A successfully refreshed from Google Patents.
US2779781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyanidation catalysts
Assignee: EIDP Inc
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Filing: 1954-12-29
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Granted: 1957-01-29
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Expires: 1974-12-29
Abstract
No abstract record available.
Inventors
- 👤 Harry B Copelin
- 👤 George B Crane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:23
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
IN THE PROCESS FOR MAKING ORGANIC CYANIDES BY THE CYANIDATION OF THE CORRESPONDING ORGANIC HALIDES, THE IMPROVEMENT WHICH COMPRISES ACCOMPLISHING SAID CYANIDATION IN THE PRESENCE OF AN EFFECTIV E CATALYTIC AMOUNT OF A QUATERNARY AMMONIUM COMPOUND STABLE AT THE TEMPERATURE EMPOLYED FOR THE CYANIDATION.
Claim 2
Dependent Claim
44 words
IN THE PROCESS FOR MAKING ORGANIC CYANIDES BY THE CYANIDATION OF THE CORRESPONDING ORGANIC HALIDES, THE IMPROVEMENT WHICH COMPRISES ACCOMPLISHING SAID CYANIDATION IN THE PRESENCE OF AN EFFECTIV E CATALYTIC AMOUNT OF A QUATERNARY AMMONIUM COMPOUND STABLE AT THE TEMPERATURE EMPOLYED FOR THE CYANIDATION.
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) | 1960-01-29 | 1960-07-30 | 1961-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-29 | 1964-07-30 | 1965-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-29 | 1968-07-30 | 1969-01-29 | $7700.00 | Window Closed / Lapsed |