US3408383A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of pentaerythritol trinitrate
Assignee: Rohm and Haas Co
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Filing: 1957-03-08
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Granted: 1968-10-29
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Expires: 1977-03-08
Abstract
No abstract record available.
Inventors
- 👤 Henry A Rolewicz
- 👤 Jr Charles D Grimes
- 👤 Jr Kenyon Stevenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:10
CPC Classifications
C; C07; C07C; C07C201/00; C07C201/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A PROCESS FOR PREPARING PENETAERYTHRITOL TRINITRATE WHICH COMPRISES REACTING BETWEEN ABOUT -5* AND ABOUT 5*C. PENTAERYTHRITOL WITH OXIDE-FREE NITRIC ACID IN A 100% TO 200% EXCESS IN THE PRESENCE OF SULFURIC ACID WHICH PROVIDES A MIXED ACID CONTAINING 30% TO 45% OF NITRIC ACID, 35% TO 55% OF SULFURIC ACID, AND 5% TO 25% OF WATER, AND IN THE PRESENCE OF METHYLENE CHLORIDE, WHEREBY NITRATED PENTAERYTHRITOL RESULTS AND FORMS A SOLUTION IN THE METHYLENE CHLORIDE, WASHING THE METHYLENE CHLORIDE SOLUTION WITH WATER, CONCENTRATING THE WASHED SOLUTION, TAKING UP THE RESULTING CONCENTRATE IN DIETHYL ETHER, FILTERING THE RESULTING SOLUTION, AND RECOVERING PENTAERYTHRITOL TRINITRATE FROM THE FILTRATE.
Claim 2
Dependent Claim
105 words
A PROCESS FOR PREPARING PENETAERYTHRITOL TRINITRATE WHICH COMPRISES REACTING BETWEEN ABOUT -5* AND ABOUT 5*C. PENTAERYTHRITOL WITH OXIDE-FREE NITRIC ACID IN A 100% TO 200% EXCESS IN THE PRESENCE OF SULFURIC ACID WHICH PROVIDES A MIXED ACID CONTAINING 30% TO 45% OF NITRIC ACID, 35% TO 55% OF SULFURIC ACID, AND 5% TO 25% OF WATER, AND IN THE PRESENCE OF METHYLENE CHLORIDE, WHEREBY NITRATED PENTAERYTHRITOL RESULTS AND FORMS A SOLUTION IN THE METHYLENE CHLORIDE, WASHING THE METHYLENE CHLORIDE SOLUTION WITH WATER, CONCENTRATING THE WASHED SOLUTION, TAKING UP THE RESULTING CONCENTRATE IN DIETHYL ETHER, FILTERING THE RESULTING SOLUTION, AND RECOVERING PENTAERYTHRITOL TRINITRATE FROM THE FILTRATE.
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) | 1971-10-29 | 1972-04-29 | 1972-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-29 | 1976-04-29 | 1976-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-29 | 1980-04-29 | 1980-10-29 | $7700.00 | Window Closed / Lapsed |