Patent US4564409A successfully refreshed from Google Patents.
Patent US2982741A successfully refreshed from Google Patents.
US2982741A
Expired / Lapsed
US
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Catalyst manufacture
Assignee: Individual
•
Filing: 1957-08-15
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Granted: 1961-05-02
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Expires: 1977-08-15
Abstract
No abstract record available.
Inventors
- 👤 David H Cleaver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:27
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/42; B01J37/00; B01J37/02; B01J37/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
IN THE MANUFACTURE OF SUPPORTED CATALYSTS AN IMPROVED METHOD FOR REDUCING METALLIC COMPOUNDS SELECTED FROM THE GROUP CONSISTING OF SALTS AND OXIDES OF THE HEAVY METALS FROM FROUPS I, VI, AND CIII OF THE PERIODIC TABLE USED IN THE PREPARATION OF SAID CATALYSTS WHICH COMPRISES THE STEPS OF PASSING SAID SUPPORTED CATALYST IMPREGNATED WITH SAID METAL COMPOUND THROUGH A CURTAIN OF SUBSTANTIALLY OXYGEN-FREE REDUCING GAS SURROUNDED BY AN ENVELOPE OF BURNING GAS.
Claim 2
Dependent Claim
72 words
IN THE MANUFACTURE OF SUPPORTED CATALYSTS AN IMPROVED METHOD FOR REDUCING METALLIC COMPOUNDS SELECTED FROM THE GROUP CONSISTING OF SALTS AND OXIDES OF THE HEAVY METALS FROM FROUPS I, VI, AND CIII OF THE PERIODIC TABLE USED IN THE PREPARATION OF SAID CATALYSTS WHICH COMPRISES THE STEPS OF PASSING SAID SUPPORTED CATALYST IMPREGNATED WITH SAID METAL COMPOUND THROUGH A CURTAIN OF SUBSTANTIALLY OXYGEN-FREE REDUCING GAS SURROUNDED BY AN ENVELOPE OF BURNING GAS.
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) | 1964-05-01 | 1964-10-31 | 1965-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-01 | 1968-10-31 | 1969-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-01 | 1972-10-31 | 1973-05-02 | $7700.00 | Window Closed / Lapsed |