US2755319A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of methylacetylene
Assignee: Dow Chemical Co
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Filing: 1953-01-26
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Granted: 1956-07-17
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Expires: 1973-01-26
Abstract
No abstract record available.
Inventors
- 👤 Durward A Baggett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:09
CPC Classifications
C; C07; C07C; C07C1/00; C07C1/26; C07C1/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A PROCESS FOR THE PRODUCTION OF METHYLACETYLENE WHICH COMPRISES REACTING 1,2-DICHLOROPROPANE WITH AN AQUEOUS SOLUTION OF A GREATER THAN EQUIMOLECULAR PROPORTION OF ALKALI METAL HYDROXIDE AT A TEMPERATURE IN THE RANGE OF FROM ABOUT 150* C. TO ABOUT 175* C. AND UNDER A SUPERATMOSPHERIC PRESSURE SUFFICIENT TO MAINTAIN THE INITIAL REACTANTS LIQUID, SAID REACTANTS CONTAINING NO MORE THAN TRACE AMOUNTS OF ELEMENTAL OXYGEN AND OF METALS OF THE GROUP CONSISTING OF COPPER, IRON, AND ZINC.
Claim 2
Dependent Claim
75 words
A PROCESS FOR THE PRODUCTION OF METHYLACETYLENE WHICH COMPRISES REACTING 1,2-DICHLOROPROPANE WITH AN AQUEOUS SOLUTION OF A GREATER THAN EQUIMOLECULAR PROPORTION OF ALKALI METAL HYDROXIDE AT A TEMPERATURE IN THE RANGE OF FROM ABOUT 150* C. TO ABOUT 175* C. AND UNDER A SUPERATMOSPHERIC PRESSURE SUFFICIENT TO MAINTAIN THE INITIAL REACTANTS LIQUID, SAID REACTANTS CONTAINING NO MORE THAN TRACE AMOUNTS OF ELEMENTAL OXYGEN AND OF METALS OF THE GROUP CONSISTING OF COPPER, IRON, AND ZINC.
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) | 1959-07-17 | 1960-01-16 | 1960-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-17 | 1964-01-16 | 1964-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-17 | 1968-01-16 | 1968-07-17 | $7700.00 | Window Closed / Lapsed |