US2632022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing 1, 8-diamino-p-menthane
Assignee: Rohm and Haas Co
•
Filing: 1950-07-07
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Granted: 1953-03-17
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Expires: 1970-07-07
Abstract
No abstract record available.
Inventors
- 👤 Newman M Bortnick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:39
CPC Classifications
C; C07; C07C; C07C211/00; C07C211/01; C07C211/16; C07C211/18; C07C2601/00; C07C2601/12; C07C2601/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A PROCESS FOR PREPARING 1,8-DIAMINO-PMENTHANE WHICH CONSISTS OF FIRST MIXING AT A TEMPERATURE OF 15*-50* C. ONE MOLE OF A MEMBER OF THE CLASS CONSISTING OF LIMONENE, TERPIN HYDRATE, ALPHA-TERPINEOL, BETA-TERPINEOL AND ALPHA-PINENE, 2 TO 3 MOLES OF HYDROGEN CYANIDE, 1.5 TO 5.0 MOLES OF SULFURIC ACID AND WATER IN AN AMOUNT EQUAL TO 0.1 TO 5 TIMES THE WEIGHT OF THE RESULTANT AQUEOUS SULFURIC ACID, HEATING SAID MIXTURE AT 40*-80* C. TO FORM 1,8-DIFORMAMIDO-P-METHANE, THEN CONTINUING HEATING FROM 80* C. TO THE REFLUXING TEMPERATURE IN THE PRESENCE OF WATER TOTALLING ONE TO NINE TIMES THE WEIGHT OF SAID SULFURIC ACID, NEUTRALIZING THE RESULTANT MIXTURE WITH A STRONG BASE, AND FINALLY ISOLATING SAID 1,8-DIAMINO-PMENTHANE.
Claim 2
Dependent Claim
114 words
A PROCESS FOR PREPARING 1,8-DIAMINO-PMENTHANE WHICH CONSISTS OF FIRST MIXING AT A TEMPERATURE OF 15*-50* C. ONE MOLE OF A MEMBER OF THE CLASS CONSISTING OF LIMONENE, TERPIN HYDRATE, ALPHA-TERPINEOL, BETA-TERPINEOL AND ALPHA-PINENE, 2 TO 3 MOLES OF HYDROGEN CYANIDE, 1.5 TO 5.0 MOLES OF SULFURIC ACID AND WATER IN AN AMOUNT EQUAL TO 0.1 TO 5 TIMES THE WEIGHT OF THE RESULTANT AQUEOUS SULFURIC ACID, HEATING SAID MIXTURE AT 40*-80* C. TO FORM 1,8-DIFORMAMIDO-P-METHANE, THEN CONTINUING HEATING FROM 80* C. TO THE REFLUXING TEMPERATURE IN THE PRESENCE OF WATER TOTALLING ONE TO NINE TIMES THE WEIGHT OF SAID SULFURIC ACID, NEUTRALIZING THE RESULTANT MIXTURE WITH A STRONG BASE, AND FINALLY ISOLATING SAID 1,8-DIAMINO-PMENTHANE.
References Cited (Backward Citations)
US2457660A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-16 | 1956-09-15 | 1957-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-16 | 1960-09-15 | 1961-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-16 | 1964-09-15 | 1965-03-17 | $7700.00 | Window Closed / Lapsed |