Patent US2508490A successfully refreshed from Google Patents.
US2508490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cobalt salicylaldehydeethylenediimine and method of production
Assignee: University of California Berkeley
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Filing: 1946-08-17
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Granted: 1950-05-23
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Expires: 1966-08-17
Abstract
No abstract record available.
Inventors
- 👤 Calvin Melvin
- 👤 Wendell M Latimer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:18
CPC Classifications
C; C07; C07F; C07F15/00; C07F15/06; C07F15/065
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
THE FORMATION OF A PREFERRED ALLOTROPIC CRYSTALLINE FORM OF COBALT SALICYLADEHYDEETHYLENE DIMINE IN ITS NON-OXYGENATED STATE BY THE STEPS OF COMBINING AQUEOUS ETHYLENEDIAMINE, ETHYL ALCOHOL, COBALT ACETATE, WATER AND SALICYLALDEHYDE IN THE ABSENCE OF AIR TO FORM A GEL; CRYSTALLIZING SAID GEL; DISSOLVING THE RESULTANT CRYSTALS IN A SOLUTION COMPRISING A BLOCKING AGENT SELECTED FROM THE GROUP CONSISTING OF PROPYL ALCOHOL AND PYRIDINE; RECRYSTALLIZING SAID DISSOLVED MATERIAL; FILTERING, WASHING AND DRYING THE RECRYSTALLIZED MATERIAL IN THE ABSENCE OF AIR TO FORM CRYSTALS CONTAINING SAID BLOCKING AGENT; AND REMOVING SAID BLOCKING AGENT BY HEATING SAID RECRYSTALLIZED MATERIAL TO AN ELEVATED TEMPERATURE IS A STREAM OF AIR TO PRECLUDE COMBINATION OF OXYGEN THEREWITH.
Claim 2
Dependent Claim
111 words
THE FORMATION OF A PREFERRED ALLOTROPIC CRYSTALLINE FORM OF COBALT SALICYLADEHYDEETHYLENE DIMINE IN ITS NON-OXYGENATED STATE BY THE STEPS OF COMBINING AQUEOUS ETHYLENEDIAMINE, ETHYL ALCOHOL, COBALT ACETATE, WATER AND SALICYLALDEHYDE IN THE ABSENCE OF AIR TO FORM A GEL; CRYSTALLIZING SAID GEL; DISSOLVING THE RESULTANT CRYSTALS IN A SOLUTION COMPRISING A BLOCKING AGENT SELECTED FROM THE GROUP CONSISTING OF PROPYL ALCOHOL AND PYRIDINE; RECRYSTALLIZING SAID DISSOLVED MATERIAL; FILTERING, WASHING AND DRYING THE RECRYSTALLIZED MATERIAL IN THE ABSENCE OF AIR TO FORM CRYSTALS CONTAINING SAID BLOCKING AGENT; AND REMOVING SAID BLOCKING AGENT BY HEATING SAID RECRYSTALLIZED MATERIAL TO AN ELEVATED TEMPERATURE IS A STREAM OF AIR TO PRECLUDE COMBINATION OF OXYGEN THEREWITH.
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) | 1953-05-22 | 1953-11-21 | 1954-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-22 | 1957-11-21 | 1958-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-22 | 1961-11-21 | 1962-05-23 | $7700.00 | Window Closed / Lapsed |