Patent US2497447A successfully refreshed from Google Patents.
US2497447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silica sol catalyst in the emulsion polymerization of butadiene-1,3 hydrocarbons
Assignee: Uniroyal Inc
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Filing: 1945-01-11
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Granted: 1950-02-14
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Expires: 1965-01-11
Abstract
No abstract record available.
Inventors
- 👤 Alfred J Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:31
CPC Classifications
C; C08; C08F; C08F4/00; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
THE PROCESS WHICH COMPRISES POLYMERIZING IN AN AQUEOUS EMULSION AT A PH FROM 2 TO BELOW 7 MATERIAL SELECTED FROM THE GROUP CONSISTING OF BUTADIENE-1,3 HYDROCARBONS AND MIXTURES OF BUTADIENE-1,3 HYDROCARBONS WITH COMPOUNDS WHICH CONTAIN A SINGLE CH2=C<GROUP AND ARE COPOLYMERIZABLE THEREWITH, IN THE PRESENCE OF .2 TO 2 PARTS DRY WEIGHT OF HYDROUS SILICA SOL PER 100 PARTS OF POLYMERIZABLE MATERIAL AS A POLYMERIZATION CATALYST.
Claim 2
Dependent Claim
66 words
THE PROCESS WHICH COMPRISES POLYMERIZING IN AN AQUEOUS EMULSION AT A PH FROM 2 TO BELOW 7 MATERIAL SELECTED FROM THE GROUP CONSISTING OF BUTADIENE-1,3 HYDROCARBONS AND MIXTURES OF BUTADIENE-1,3 HYDROCARBONS WITH COMPOUNDS WHICH CONTAIN A SINGLE CH2=C<GROUP AND ARE COPOLYMERIZABLE THEREWITH, IN THE PRESENCE OF .2 TO 2 PARTS DRY WEIGHT OF HYDROUS SILICA SOL PER 100 PARTS OF POLYMERIZABLE MATERIAL AS A POLYMERIZATION CATALYST.
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) | 1953-02-13 | 1953-08-15 | 1954-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-13 | 1957-08-15 | 1958-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-13 | 1961-08-15 | 1962-02-14 | $7700.00 | Window Closed / Lapsed |