US3699176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recrystallizing hexanitrostilbene
Assignee: Del Mar Engineering Laboratories
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Filing: 1970-10-02
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Granted: 1972-10-17
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Expires: 1990-10-02
Abstract
Abstract An improved apparatus and process is provided for processing the explosive known as Hexanitrostilbene (HNS) from a form known as HNS-I into a form known as HNS-II, to provide a refined product with a unique crystal form so as to facilitate handling of the material. The process of the invention involves an improved extraction technique involving the use of a solution of acetonitrile in which HNS-I is soluble and xylene in which HNS is insoluble for refining the HNS-I into an improved type of HNSII.
Inventors
- 👤 Leroy J Syrop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:05
CPC Classifications
C; C07; C07C; C07C201/00; C07C201/06; C07C201/16; B; B01; B01J; B01J2219/00; B01J2219/19; B01J2219/194; B01J2219/1941; B01J2219/1942
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
28 words
The process defined in claim 1, in which said boiling point of said precipitant solution is displaced substantially 60* C above the boiling point of said solvent solution.
Claim 2
Dependent Claim
12 words
The process defined in claim 1, in which said solvent is acetronitrile.
Claim 3
Dependent Claim
12 words
The process defined in claim 3, in which said precipitant is xylene.
Claim 4
Dependent Claim
25 words
The process defined in claim 4, in which said xylene is of a type selected from a group consisting of ortho, meta and para xylene.
Claim 5
Dependent Claim
43 words
The process defined in claim 1, in which said solvent solution and precipitant solution are initially mixed together, and in which said solvent is vaporized and condensed so that the condensate may pass through the aforesaid Type-I hexanitrostilbene and into the precipitant solution.
References Cited (Backward Citations)
US3418372A
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US3213132A
Cited
US3417153A
Cited
US3201481A
Cited
US3505413A
Cited
US3267159A
Cited
US3461112A
Cited
US3514495A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |