Patent US3420877A successfully refreshed from Google Patents.
US3420877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of fluorocarbon sulfinates and derivatives thereof
Assignee: 3M Co
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Filing: 1965-10-23
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Granted: 1969-01-07
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Expires: 1985-10-23
Abstract
No abstract record available.
Inventors
- 👤 Frank J Pavlik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:54
CPC Classifications
C; C07; C07C; C07C313/00; C07C313/02; C07C313/04; C07C303/00; C07C303/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A PROCESS WHICH COMPRISES REACTING AN ALKALI METAL SULFITE OR AN ALKALINE EARTH METAL SULFITE IN AN AQUEOUS MEDIUM CONTAINING FROM ABOUT 10 TO ABOUT 50 WEIGHT PERCENT OF A DISSOLVED POLAR, INERT ORGANIC SOLVENT SELECTED FROM THE GROUP CONSISTING OF DIOXANE, DIMETHOXYETHANE, DI-N-BUTYL ETHER, TETRAHYDROFURAN, AND DIETHYLENE GLYCOL DIETHYL ETHER WITH A COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
57 words
A PROCESS WHICH COMPRISES REACTING AN ALKALI METAL SULFITE OR AN ALKALINE EARTH METAL SULFITE IN AN AQUEOUS MEDIUM CONTAINING FROM ABOUT 10 TO ABOUT 50 WEIGHT PERCENT OF A DISSOLVED POLAR, INERT ORGANIC SOLVENT SELECTED FROM THE GROUP CONSISTING OF DIOXANE, DIMETHOXYETHANE, DI-N-BUTYL ETHER, TETRAHYDROFURAN, AND DIETHYLENE GLYCOL DIETHYL ETHER WITH A COMPOUND OF THE FORMULA
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) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |