US2825699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of iron from clay catalysts
Assignee: Houdry Process Corp
•
Filing: 1954-07-20
•
Granted: 1958-03-04
•
Expires: 1974-07-20
Abstract
No abstract record available.
Inventors
- 👤 James E Mcevoy
- 👤 Jr Thomas H Milliken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:21
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
IN A METHOD OF PREPARING CATALYTIC CONTACT MASSES FROM CLAY CONTAINING IRON COMPOUNDS AND HEAT TREATED FOR TRANSFORMING THE IRON COMPOUNDS INTO AN EASILY REMOVABLE CONDITION, THE STEPS OF TREATING SAID HEAT TREATED CLAY WITH AMMONIUM CHLORIDE AND HEATING SAID CLAY IN THE PRESENCE OF SAID AMMONIUM CHLORIDE TO A TEMPERATURE SUFFICIENT TO TRANSFORM SAID IRON COMPOUNDS INTO FERRIC CHLORIDE BUT INSUFFICIENT TO DEVELOP SUBSTANTIAL AMOUNTS OF FREE HYDROGEN BY DECOMPOSITION OF SAID AMMONIUM CHLORIDE, AND SUBSEQUENTLY PURGING THE TREATED CLAY BY AN INERT GASEOUS MEDIUM AT AN ELEVATED TEMPERATURE SUFFICIENTLY HIGH TO VOLATILIZE FERRIC CHLORIDE BUT NOT HIGH ENOUGH TO DECOMPOSE AMMONIUM COMPOUNDS PRESENT WITH DEVELOPMENT OF SUBSTANTIAL AMOUNTS OF FREE HYDROGEN.
Claim 2
Dependent Claim
113 words
IN A METHOD OF PREPARING CATALYTIC CONTACT MASSES FROM CLAY CONTAINING IRON COMPOUNDS AND HEAT TREATED FOR TRANSFORMING THE IRON COMPOUNDS INTO AN EASILY REMOVABLE CONDITION, THE STEPS OF TREATING SAID HEAT TREATED CLAY WITH AMMONIUM CHLORIDE AND HEATING SAID CLAY IN THE PRESENCE OF SAID AMMONIUM CHLORIDE TO A TEMPERATURE SUFFICIENT TO TRANSFORM SAID IRON COMPOUNDS INTO FERRIC CHLORIDE BUT INSUFFICIENT TO DEVELOP SUBSTANTIAL AMOUNTS OF FREE HYDROGEN BY DECOMPOSITION OF SAID AMMONIUM CHLORIDE, AND SUBSEQUENTLY PURGING THE TREATED CLAY BY AN INERT GASEOUS MEDIUM AT AN ELEVATED TEMPERATURE SUFFICIENTLY HIGH TO VOLATILIZE FERRIC CHLORIDE BUT NOT HIGH ENOUGH TO DECOMPOSE AMMONIUM COMPOUNDS PRESENT WITH DEVELOPMENT OF SUBSTANTIAL AMOUNTS OF FREE HYDROGEN.
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) | 1961-03-03 | 1961-09-02 | 1962-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-03 | 1965-09-02 | 1966-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-03 | 1969-09-02 | 1970-03-04 | $7700.00 | Window Closed / Lapsed |