Patent US6499376B2 successfully refreshed from Google Patents.
Patent US2645656A successfully refreshed from Google Patents.
US2645656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of surface active sulfates
Assignee: Anglo Iranian Oil Co Ltd
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Filing: 1950-07-13
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Granted: 1953-07-14
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Expires: 1970-07-13
Abstract
No abstract record available.
Inventors
- 👤 Oldham Wilfred John
- 👤 Wirth Max Marin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:49
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/24
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
85 words
A PROCESS FOR THE PRODUCTION OF A SURFACE ACTIVE AGENT WHICH COMPRISES REACTING AN HYDROPEROXIDE SELECTED FROM THE GROUP CONSISTING OF LONG CHAIN ALKYL HYDROPEROXIDES, ALKYL NAPHTHENE HYDROPEROXIDES AND MIXTURES THEROF WITH SULPHUR DIOXIDE TO PRODUCE A SULPHATE SELECTED FROM THE GROUP OF ALKYL HYDROGEN SULPHATES, ALKYL NAPHTHENE HYDROGEN SULPHATES AND MIXTURES THEREOF, AND REACTING SAID SULPHATE PRODUCED WITH A BASIC SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF METAL OXIDES, METAL HYDROXIDES, METAL CARBONATES, AMMONIA AND ORGANIC BASES TO FORM A SALT OF SAID SULPHATE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-13 | 1957-01-12 | 1957-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-13 | 1961-01-12 | 1961-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-13 | 1965-01-12 | 1965-07-14 | $7700.00 | Window Closed / Lapsed |