Patent US1799767A successfully refreshed from Google Patents.
Patent US3773572A successfully refreshed from Google Patents.
US3773572A
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Pentaerythritol tetranitrate coated with silicone
Assignee: Imperial Chemical Industries Ltd
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Filing: 1972-09-22
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Granted: 1973-11-20
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Expires: 1992-09-22
Abstract
Abstract Improved Pentaerythritol Tetranitrate is prepared by treating the PETN with silicone to reduce its water permeability. The improved PETN is especially useful for detonating cord.
Inventors
- 👤 H Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:18
CPC Classifications
C; C06; C06C; C06C5/00; C06C5/04; C06B; C06B25/00; C06B25/32; C06B45/00; C06B45/18; C06B45/20; C06B45/22
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
15 words
PETN as claimed in claim 1 comprising 0.1 to 0.5 percent by weight of silicone.
Claim 2
Dependent Claim
13 words
PETN as claimed in claim 1 wherein the silicone is soluble in acetone.
Claim 3
Dependent Claim
54 words
PETN as claimed in claim 1 wherein the silicone comprises a polysiloxane containing units having the structure RxSiO(4 x)/2 wherein R represents a member of the group consisting of hydrogen monovalent hydrocarbon groups, not more than one hydrogen atom being attached to any Si atom, and x is an integer not greater than 2.
Claim 4
Dependent Claim
73 words
PETN as claimed in Claim 4 wherein the silicone is selected from the group consisting of linear polysiloxanes having the formula (CH3)3Si (OSiR2)n OSi(CH3)3 wherein R represents a member of the group consisting of hydrogen and alkyl groups and n is an integer and cyclic polysiloxanes having the formula (SiR2O)n wherein R represents a member of the group consisting of hydrogen and alkyl groups and n is an integer of 3 to 8.
Claim 5
Dependent Claim
47 words
PETN as claimed in claim 5 wherein the silicone is selected from the group consisting of trimethyl siloxy end-blocked polymethyl hydrogen siloxane containing on average 40 to 100 polysiloxane units, trimethyl siloxy end-blocked polydimethyl siloxane containing on average 40 to 100 polysiloxane units and methyl hydrogen cyclotetrasiloxane.
Claim 6
Dependent Claim
17 words
A method of preparing PETN as claimed in Claim 1 wherein PETN particles are coated with silicone.
Claim 7
Dependent Claim
20 words
A method as claimed in claim 7 wherein the PETN particles are formed by deposition from a solution containing silicone.
Claim 8
Dependent Claim
32 words
A method as claimed in claim 8 wherein PETN and silicone are dissolved in a mutual solvent and silicone coated PETN particles are deposited by the addition of water to the solution.
Claim 9
Dependent Claim
12 words
Detonating fuse-cord having a core of PETN as claimed in claim 1.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |