Patent US3811446A successfully refreshed from Google Patents.
US2969403A
Expired / Lapsed
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Method for the preparation of chlorofluorocarbon oils or waxes
Assignee: Hoechst AG
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Filing: 1955-09-07
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Granted: 1961-01-24
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Expires: 1975-09-07
Abstract
No abstract record available.
Inventors
- 👤 Frey Hans-Helmut
- 👤 Kahrs Karl-Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:28
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A METHOD FOR THE PREPARATION OF LIQUID LOW MOLECULAR WEIGHT POLYMERS CONSISTING ESSENTIALLY OF CARBON, FLUORINE, AND CHLORINE, WHICH COMPRISES THERMALLY DECOMPOSING HIGH MOLECULAR WEIGHT POLYMERS CONSISTING ESSENTIALLY OF CARBON, FLUORINE, AND CHLORINE AT REDUCED PRESSURE AND AT A TEMPERATURE IN THE RANGE OF ABOUT 50 TO 350O C. IN THE PRESENCE OF AN ADDITIVE SELECTED FROM THE GROUP CONSISTING OF COPPER SULFATE AND FERRIC OXIDE.
Claim 2
Independent Claim
66 words
A METHOD FOR THE PREPARATION OF LIQUID LOW MOLECULAR WEIGHT POLYMERS CONSISTING ESSENTIALLY OF CARBON, FLUORINE, AND CHLORINE, WHICH COMPRISES THERMALLY DECOMPOSING HIGH MOLECULAR WEIGHT POLYMERS CONSISTING ESSENTIALLY OF CARBON, FLUORINE, AND CHLORINE AT REDUCED PRESSURE AND AT A TEMPERATURE IN THE RANGE OF ABOUT 50 TO 350O C. IN THE PRESENCE OF AN ADDITIVE SELECTED FROM THE GROUP CONSISTING OF COPPER SULFATE AND FERRIC OXIDE.
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) | 1964-01-24 | 1964-07-25 | 1965-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-24 | 1968-07-25 | 1969-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-24 | 1972-07-25 | 1973-01-24 | $7700.00 | Window Closed / Lapsed |