US2820001A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rectification process
Assignee: Shell Development Co
•
Filing: 1953-01-19
•
Granted: 1958-01-14
•
Expires: 1973-01-19
Abstract
No abstract record available.
Inventors
- 👤 Willem J D Van Dijck
- 👤 Pieter L Kooijman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:07
CPC Classifications
C; C01; C01B; C01B15/00; C01B15/01; C01B15/013; B; B01; B01D; B01D3/00; B01D3/14; B01D3/143; B01D3/146
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
THE PROCESS FOR THE RECOVERY OF HYDROGEN PEROXIDE FREE OF ANY SUBSTANTIAL AMOUNT OF ORGANIC IMPURITIES FROM AN AQUEOUS MIXTURE COMPRISING FORMIC ACID AND HYDROGEN PEROXIDE WHICH COMPRISES INTRODUCING SAID AQUEOUS MIXTURE INTO A FRACTIONATING ZONE AT A POINT INTERMEDIATE THE POINTS OF REMOVAL OF VAPOR OVERHEAD AND LIQUID BOTTOMS, INTRODUCING WATER VAPOR INTO SAID FRACTIONATING ZONE AT A POINT INTERMEDEDIATE THE POINT OF INTRODUCTION OF SAID AQUEOUS MIXTURE AND THE POINT OF WITHDRAWAL OF LIQUID BOTTOMS, FRACTIONATING SAID AQUEOUS MIXTURE IN THE PRESENCE OF SAID ADDED WATER VAPOR IN SAID FRACTIONATING ZONE, THEREBY FORMING A VAPOR FRACTION
Claim 2
Dependent Claim
98 words
THE PROCESS FOR THE RECOVERY OF HYDROGEN PEROXIDE FREE OF ANY SUBSTANTIAL AMOUNT OF ORGANIC IMPURITIES FROM AN AQUEOUS MIXTURE COMPRISING FORMIC ACID AND HYDROGEN PEROXIDE WHICH COMPRISES INTRODUCING SAID AQUEOUS MIXTURE INTO A FRACTIONATING ZONE AT A POINT INTERMEDIATE THE POINTS OF REMOVAL OF VAPOR OVERHEAD AND LIQUID BOTTOMS, INTRODUCING WATER VAPOR INTO SAID FRACTIONATING ZONE AT A POINT INTERMEDEDIATE THE POINT OF INTRODUCTION OF SAID AQUEOUS MIXTURE AND THE POINT OF WITHDRAWAL OF LIQUID BOTTOMS, FRACTIONATING SAID AQUEOUS MIXTURE IN THE PRESENCE OF SAID ADDED WATER VAPOR IN SAID FRACTIONATING ZONE, THEREBY FORMING A VAPOR FRACTION
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-13 | 1961-07-15 | 1962-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-13 | 1965-07-15 | 1966-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-13 | 1969-07-15 | 1970-01-14 | $7700.00 | Window Closed / Lapsed |