US3004831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of hydrogen peroxide
Assignee: PPG Industries Inc
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Filing: 1958-08-07
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Granted: 1961-10-17
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Expires: 1978-08-07
Abstract
No abstract record available.
Inventors
- 👤 Fulton H Hungerford
- 👤 Richard J Samelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:51
CPC Classifications
C; C01; C01B; C01B15/00; C01B15/01; C01B15/022; C01B15/023
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
IN THE METHOD OF PRODUCING HYDROGEN PEROXIDE BY ALTERNATE CATALYTIC HYDROGENATION OF A MEMBER OF THE GROUP CONSISTING OF QUINONES AND AZOBENZENES IN LIQUID PHASE AND IN THE PRESENCE OF METALLIC HYDROGENATION CATALYST, OXIDATION OF THE RESULTING HYDROGENATED PRODUCT TO LIBERATE HYDROGEN PEROXIDE AND RECOVERING THE HYDROGEN PEROXIDE, THE IMPROVEMENT WHICH COMPRISES PERIODICALLY REDUCING THE PRESSURE OF HYDROGEN IN CONTACT WITH SAID LIQUID PHASE AFTER THE CATALYST ACTIVITY HAS DIMINISHED AND PASSING AN INERT GAS THROUGH SAID LIQUID WHILE THE CATALYST IS IN CONTACT THEREWITH AND WHILE THE HYDROGEN PRESSURE IS REDUCED, CONTINUING SAID PASSAGE OF INERT GAS UNTIL THE ACTIVITY OF THE CATALYST HAS INCREASED, AND THEREAFTER INCREASING THE HYDROGEN PRESSURE IN CONTACT WITH SAID LIQUID PHASE.
Claim 2
Dependent Claim
118 words
IN THE METHOD OF PRODUCING HYDROGEN PEROXIDE BY ALTERNATE CATALYTIC HYDROGENATION OF A MEMBER OF THE GROUP CONSISTING OF QUINONES AND AZOBENZENES IN LIQUID PHASE AND IN THE PRESENCE OF METALLIC HYDROGENATION CATALYST, OXIDATION OF THE RESULTING HYDROGENATED PRODUCT TO LIBERATE HYDROGEN PEROXIDE AND RECOVERING THE HYDROGEN PEROXIDE, THE IMPROVEMENT WHICH COMPRISES PERIODICALLY REDUCING THE PRESSURE OF HYDROGEN IN CONTACT WITH SAID LIQUID PHASE AFTER THE CATALYST ACTIVITY HAS DIMINISHED AND PASSING AN INERT GAS THROUGH SAID LIQUID WHILE THE CATALYST IS IN CONTACT THEREWITH AND WHILE THE HYDROGEN PRESSURE IS REDUCED, CONTINUING SAID PASSAGE OF INERT GAS UNTIL THE ACTIVITY OF THE CATALYST HAS INCREASED, AND THEREAFTER INCREASING THE HYDROGEN PRESSURE IN CONTACT WITH SAID LIQUID PHASE.
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) | 1964-10-16 | 1965-04-17 | 1965-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-16 | 1969-04-17 | 1969-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-16 | 1973-04-17 | 1973-10-17 | $7700.00 | Window Closed / Lapsed |