US3330625A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogen peroxide manufacture
Assignee: PPG Industries Inc
•
Filing: 1963-10-22
•
Granted: 1967-07-11
•
Expires: 1983-10-22
Abstract
No abstract record available.
Inventors
- 👤 Paul H Baker
- 👤 James A Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:51
CPC Classifications
C; C01; C01B; C01B15/00; C01B15/01; C01B15/022; C01B15/023
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A PROCESS FOR INCREASING THE HYDROGEN PEROXIDE FORMING CAPACITY OF A WORKING SOLUTION DEPLETED IN ITS CAPACITY TO FORM HYDROGEN PEROXIDE THROGH USE IN A CYCLIC PROCESS FOR HYDROGEN PEROXIDE BY THE ALTERNATE STEPS OF HYDROGENATION AND OXIDATION OF A QUINONE DISSOLVED THEREIN, WHICH COMPRISES WITHDRAWING WORKING SOLUTION FROM THE CYCLIC SYSTEM, SEPARATING AT LEAST 90 PERCENT OF THE SOLVENT FROM SOLUTE LEAVING A SOLVENT-LEAN RESIDUE OF THE QUINONE AND ITS TETRAHYDROQUINONE, HEATING SAID SOLVENT-LEAN RESIDUE TO A TEMPERATURE OF AT LEAST 200*C. FOR A SHORT PERIOD OF AT LEAST 5 MINUTES AND UNTIL THERE IS A MARKED INCREASE IN THE QUINONE CONTENT AND HYDROGEN PEROXIDE PRODUCING CAPACITY OF THE RESIDUE AND THEN DISCONTINUING THE HEATING BEFORE THE RATE AT WHICH THE TETRAHYDROQUINONE CONTENT DECREASES EXCEEDS THE RATE AT WHICH THE QUINONE CONTENT IS INCREASING.
Claim 2
Dependent Claim
135 words
A PROCESS FOR INCREASING THE HYDROGEN PEROXIDE FORMING CAPACITY OF A WORKING SOLUTION DEPLETED IN ITS CAPACITY TO FORM HYDROGEN PEROXIDE THROGH USE IN A CYCLIC PROCESS FOR HYDROGEN PEROXIDE BY THE ALTERNATE STEPS OF HYDROGENATION AND OXIDATION OF A QUINONE DISSOLVED THEREIN, WHICH COMPRISES WITHDRAWING WORKING SOLUTION FROM THE CYCLIC SYSTEM, SEPARATING AT LEAST 90 PERCENT OF THE SOLVENT FROM SOLUTE LEAVING A SOLVENT-LEAN RESIDUE OF THE QUINONE AND ITS TETRAHYDROQUINONE, HEATING SAID SOLVENT-LEAN RESIDUE TO A TEMPERATURE OF AT LEAST 200*C. FOR A SHORT PERIOD OF AT LEAST 5 MINUTES AND UNTIL THERE IS A MARKED INCREASE IN THE QUINONE CONTENT AND HYDROGEN PEROXIDE PRODUCING CAPACITY OF THE RESIDUE AND THEN DISCONTINUING THE HEATING BEFORE THE RATE AT WHICH THE TETRAHYDROQUINONE CONTENT DECREASES EXCEEDS THE RATE AT WHICH THE QUINONE CONTENT IS INCREASING.
References Cited (Backward Citations)
US2940987A
Cited
GB896346A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-10 | 1971-01-09 | 1971-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-10 | 1975-01-09 | 1975-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-10 | 1979-01-09 | 1979-07-11 | $7700.00 | Window Closed / Lapsed |