Patent US3223794A successfully refreshed from Google Patents.
Patent US2698339A successfully refreshed from Google Patents.
US2698339A
Expired / Lapsed
US
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Manufacture of pimelic acid and intermediates therefor
Assignee: Distillers Co Yeast Ltd
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Filing: 1951-12-17
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Granted: 1954-12-28
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Expires: 1971-12-17
Abstract
No abstract record available.
Inventors
- 👤 Hawkins Edwin George Edward
- 👤 Stern Edward Severin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:03
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/295
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
89 words
IN A PROCESS FOR THE PREPARATION OF PIMELIC ACID BY HEATING DELTA3-TETRAHYDROBENZOIC ACID IN THE PRESENCE OF ALKALI TO A TEMPERATURE IN THE RANGE 250* TO 400* C. TO GIVE A SALT OF PIMELIC ACID, THAT IMPROVEMENT COMPRISING CONDENSING DELTA3-TETRAHYDROBENAALDEHYDE CONTAINING LESS THAN ABOUT 3% OF ACIDIC IMPURITIES IN THE PRESENCE OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALUMINIUM AND MAGNESIUM ALKOXIDES AT A TEMPERATURE BETWEEN 0* C. AND 110* C. TO GIVE DELTA3-TETRAHYDROBENZYL DELTA3TETRAHYDROBENZOATE AND HYDROLYSING SAID DELTA3-TETRAHYDROBENZYL DELTA3-TETRAHYDROBENZOATE TO PRODUCE DELTA3TETRAHYDROBENZOIC ACID AND DELTA3-TERRAHYDROBENZYL ALCOHOL.
Claim 2
Dependent Claim
89 words
IN A PROCESS FOR THE PREPARATION OF PIMELIC ACID BY HEATING DELTA3-TETRAHYDROBENZOIC ACID IN THE PRESENCE OF ALKALI TO A TEMPERATURE IN THE RANGE 250* TO 400* C. TO GIVE A SALT OF PIMELIC ACID, THAT IMPROVEMENT COMPRISING CONDENSING DELTA3-TETRAHYDROBENAALDEHYDE CONTAINING LESS THAN ABOUT 3% OF ACIDIC IMPURITIES IN THE PRESENCE OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALUMINIUM AND MAGNESIUM ALKOXIDES AT A TEMPERATURE BETWEEN 0* C. AND 110* C. TO GIVE DELTA3-TETRAHYDROBENZYL DELTA3TETRAHYDROBENZOATE AND HYDROLYSING SAID DELTA3-TETRAHYDROBENZYL DELTA3-TETRAHYDROBENZOATE TO PRODUCE DELTA3TETRAHYDROBENZOIC ACID AND DELTA3-TERRAHYDROBENZYL ALCOHOL.
Claim 3
Dependent Claim
43 words
A PROCESS FOR THE PREPARATION OF DELTA3-TETRAHYDROBENZYL DELTA3-TETRAHYDROBENZOATE WHICH COMPRISES CONDENSING DELTA3-TETRAHYDROBENZALDEHYDE CONTAINING LESS THAN ABOUT 3% OF ACIDIC IMPURITIES IN THE PRESENCE OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALUMINIUM AND MAGNESIUM ALKOXIDES AT A TEMPERATURE BETWEEN 0*C. AND 110*C.
Claim 4
Dependent Claim
43 words
A PROCESS FOR THE PREPARATION OF DELTA3-TETRAHYDROBENZYL DELTA3-TETRAHYDROBENZOATE WHICH COMPRISES CONDENSING DELTA3-TETRAHYDROBENZALDEHYDE CONTAINING LESS THAN ABOUT 3% OF ACIDIC IMPURITIES IN THE PRESENCE OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALUMINIUM AND MAGNESIUM ALKOXIDES AT A TEMPERATURE BETWEEN 0*C. AND 110*C.
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) | 1957-12-27 | 1958-06-28 | 1958-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-27 | 1962-06-28 | 1962-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-27 | 1966-06-28 | 1966-12-28 | $7700.00 | Window Closed / Lapsed |