Patent US2973394A successfully refreshed from Google Patents.
US2973394A
Expired / Lapsed
US
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Method of purifying styrene
Assignee: WR Grace and Co
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Filing: 1958-01-30
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Granted: 1961-02-28
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Expires: 1978-01-30
Abstract
No abstract record available.
Inventors
- 👤 Edward R Atkinson
- 👤 Jacob G Mark
- 👤 Rubinstein David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:59
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/152; C07C7/156
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A PROCESS FOR THE SEPARATION OF A VINYL-SUBSTITUTED AROMATIC COMPOUND FROM A MIXED HYDROCARBON STREAM WHICH INCLUDES THE STEPS OF MIXING THE HYDROCARBON STREAM WITH A SOLID, UNDISSOLVED MONOVALENT SALT OF A METAL SELECTED FROM THE GROUP CONSISTING OF COPPER AND SILVER UNDER CONDITIONS SUCH AS TO FORM A SOLID COORDINATION COMPOUND OF THE SAID VINYL-SUBSTITUTED AROMATIC COMPOUND AND THE SAID MONOVALENT SALT, REMOVING THE UNREACTED HYDROCARBON FROM THE MIXTURE AND THEREAFTER HEATING THE SOLID COORDINATION COMPOUND IN ORDER TO CAUSE DECOMPOSITION THEREOF AND TO RECOVER THE VINYL-SUBSTITUTED AROMATIC COMPOUND.
Claim 2
Dependent Claim
90 words
A PROCESS FOR THE SEPARATION OF A VINYL-SUBSTITUTED AROMATIC COMPOUND FROM A MIXED HYDROCARBON STREAM WHICH INCLUDES THE STEPS OF MIXING THE HYDROCARBON STREAM WITH A SOLID, UNDISSOLVED MONOVALENT SALT OF A METAL SELECTED FROM THE GROUP CONSISTING OF COPPER AND SILVER UNDER CONDITIONS SUCH AS TO FORM A SOLID COORDINATION COMPOUND OF THE SAID VINYL-SUBSTITUTED AROMATIC COMPOUND AND THE SAID MONOVALENT SALT, REMOVING THE UNREACTED HYDROCARBON FROM THE MIXTURE AND THEREAFTER HEATING THE SOLID COORDINATION COMPOUND IN ORDER TO CAUSE DECOMPOSITION THEREOF AND TO RECOVER THE VINYL-SUBSTITUTED AROMATIC COMPOUND.
References Cited (Backward Citations)
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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) | 1964-02-28 | 1964-08-29 | 1965-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-28 | 1968-08-29 | 1969-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-28 | 1972-08-29 | 1973-02-28 | $7700.00 | Window Closed / Lapsed |