US2517709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of bicyclic acid c10h16o2
Assignee: Dow Chemical Co
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Filing: 1949-06-20
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Granted: 1950-08-08
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Expires: 1969-06-20
Abstract
No abstract record available.
Inventors
- 👤 Earl L Pelton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:17
CPC Classifications
C; C07; C07C; C07C61/00; C07C61/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A METHOD OF PURIFYING THE CRUDE CRYSTALLINE ACID C10H16O2 PREPARABLE BY THE CAUSTIC ALKALI FUSION OF HYDROXYTETRAHYDRO-NOR-DICYCLOPENTADIENE WHICH COMPRISES DISPERSING THE CRUDE ACID IN WATER AT A TEMPERATURE ABOVE THE MELTING POINT OF THE CRUDE ACID AND CONTAINING A SMALL PROPORTION OF AN EMULSIFYING AGENT, COOLING THE RESULTING DISPERSION TO A TEMPERATURE BELOW THE MELTING POINT OF THE ACID UNTIL THE ACID SEPARATES AS A SOLID PHASE, AND SEPARATING THE SOLIDIFIED ACID FROM THE COOLED DISPERSION.
Claim 2
Independent Claim
76 words
A METHOD OF PURIFYING THE CRUDE CRYSTALLINE ACID C10H16O2 PREPARABLE BY THE CAUSTIC ALKALI FUSION OF HYDROXYTETRAHYDRO-NOR-DICYCLOPENTADIENE WHICH COMPRISES DISPERSING THE CRUDE ACID IN WATER AT A TEMPERATURE ABOVE THE MELTING POINT OF THE CRUDE ACID AND CONTAINING A SMALL PROPORTION OF AN EMULSIFYING AGENT, COOLING THE RESULTING DISPERSION TO A TEMPERATURE BELOW THE MELTING POINT OF THE ACID UNTIL THE ACID SEPARATES AS A SOLID PHASE, AND SEPARATING THE SOLIDIFIED ACID FROM THE COOLED DISPERSION.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-07 | 1954-02-06 | 1954-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-07 | 1958-02-06 | 1958-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-07 | 1962-02-06 | 1962-08-08 | $7700.00 | Window Closed / Lapsed |