Patent US2800507A successfully refreshed from Google Patents.
US2800507A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of pimelic acid
Assignee: Distillers Co Yeast Ltd
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Filing: 1952-07-22
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Granted: 1957-07-23
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Expires: 1972-07-22
Abstract
No abstract record available.
Inventors
- 👤 Long Dennis James George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:56
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/295; C07C51/42; C07C51/43; C07C51/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
A PROCESS FOR THE PURIFICATION OF CRUDE PIMELIC ACID PREPARED BY THE REACTION OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF$3- TETRAHYDROBENZOIC ACID, ALKALINE SALTS OF $3-TETRAHYDROBENZOIC ACID, $3-TETRAHYDROBENZYL$3-TETRAHYDROBENZOTE, $3-TETRAHYDROBENZONITRILE AND $3TETRAHYDROBENZALDEHYDE WITH AN ALKALI METAL HYDROXIDE IN THE PRESENCE OF WATER AT A TEMPERATURE IN THE RANGE OF 250*C-400*C. WHICH COMPRISES THE STEPS OF ACIDIFYING THE REACTION PRODUCT CONTAINING AN ALKALI METAL SALT OF PIMELIC ACID, SUBJECTING THE RESULTANT AQUEOUS CRUDE PIMELIC ACID TO STEAM DISTILLATION TO REMOVE IMPURITIES BOILING BELOW PIMELIC ACID, SEPARATING THE AQUEOUS PHASE CONTAINING THE PIMELIC ACID AND RECOVERING THE PIMELIC ACID THEREFROM.
Claim 2
Dependent Claim
99 words
A PROCESS FOR THE PURIFICATION OF CRUDE PIMELIC ACID PREPARED BY THE REACTION OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF$3- TETRAHYDROBENZOIC ACID, ALKALINE SALTS OF $3-TETRAHYDROBENZOIC ACID, $3-TETRAHYDROBENZYL$3-TETRAHYDROBENZOTE, $3-TETRAHYDROBENZONITRILE AND $3TETRAHYDROBENZALDEHYDE WITH AN ALKALI METAL HYDROXIDE IN THE PRESENCE OF WATER AT A TEMPERATURE IN THE RANGE OF 250*C-400*C. WHICH COMPRISES THE STEPS OF ACIDIFYING THE REACTION PRODUCT CONTAINING AN ALKALI METAL SALT OF PIMELIC ACID, SUBJECTING THE RESULTANT AQUEOUS CRUDE PIMELIC ACID TO STEAM DISTILLATION TO REMOVE IMPURITIES BOILING BELOW PIMELIC ACID, SEPARATING THE AQUEOUS PHASE CONTAINING THE PIMELIC ACID AND RECOVERING THE PIMELIC ACID THEREFROM.
References Cited (Backward Citations)
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Cited
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Cited
US2182056A
Cited
US2217516A
Cited
US2454047A
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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) | 1960-07-22 | 1961-01-21 | 1961-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-22 | 1965-01-21 | 1965-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-22 | 1969-01-21 | 1969-07-23 | $7700.00 | Window Closed / Lapsed |