US4080902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High speed igniter device
Assignee: Teledyne Mccormick Selph
•
Filing: 1976-11-04
•
Granted: 1978-03-28
•
Expires: 1996-11-04
Abstract
Abstract An ignition device in the form of a linear member which has an internal linear propagation characteristic of a detonation, but a radial heat and gas evolution characteristic of a very fast deflagrating pyrotechnic material not accompanied by a shock or detonation wave. The device uses a central core containing an encapsulated explosive with a surrounding layer, or discrete layers, of a metal-clad pyrotechnic material that is significantly characterized by a class of compounds that are specific simple decahydrodecaborate salts containing the common anion B 10 H 10 -2 . The outer cladding materials themselves do not functionally ensure a radial deflagration; rather the specific pyrotechnic materials employed ensure a radial deflagration. There are taught specific relationships for components, and a necessary radial compaction.
Inventors
- 👤 Terrence P. Goddard
- 👤 Samuel D. Webb
- 👤 Donald N. Thatcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:07
CPC Classifications
C; C06; C06C; C06C5/00; C06C5/04; C06B; C06B47/00; C06B47/02; C06B47/10
Claims Analysis
Total Claims: 68
Claim 1
Independent Claim
182 words
In an igniter device comprising a centrally disposed high explosive which is linearly encapsulated, the improvement comprising a linear distribution of metal cladded pyrotechnic material about said encapsulation and in intimate contact therewith, wherein said pyrotechnic material includes an oxidizing agent combined with a simple decahydrodecaborate salt, having the common anion B 10 H 10 -2 wherein the cation is selected from the group consisting of: i. ammonium, wherein the salt has the formula (NH 4 ) 2 B 10 H 10 ; ii. hydrazinium, wherein the salt has the general formula (NH 2 NH 3 ) B 10 H 10 ; iii. substituted ammonium cations, wherein the salt has the general formula (R 3 NH) 2 B 10 H 10 , wherein further R is selected from the group consisting of hydrogen and alkyl radicals containing less than six carbon atoms; iv. substituted hydrazinium cations, wherein the salt has the general formula (R 2 NNR 2 H) 2 B 10 H 10 wherein further R is selected from the group consisting of hydrogen and alkyl radicals containing less than six atoms.
Claim 2
Dependent Claim
182 words
In an igniter device comprising a centrally disposed high explosive which is linearly encapsulated, the improvement comprising a linear distribution of metal cladded pyrotechnic material about said encapsulation and in intimate contact therewith, wherein said pyrotechnic material includes an oxidizing agent combined with a simple decahydrodecaborate salt, having the common anion B 10 H 10 -2 wherein the cation is selected from the group consisting of: i. ammonium, wherein the salt has the formula (NH 4 ) 2 B 10 H 10 ; ii. hydrazinium, wherein the salt has the general formula (NH 2 NH 3 ) B 10 H 10 ; iii. substituted ammonium cations, wherein the salt has the general formula (R 3 NH) 2 B 10 H 10 , wherein further R is selected from the group consisting of hydrogen and alkyl radicals containing less than six carbon atoms; iv. substituted hydrazinium cations, wherein the salt has the general formula (R 2 NNR 2 H) 2 B 10 H 10 wherein further R is selected from the group consisting of hydrogen and alkyl radicals containing less than six atoms.
Claim 3
Dependent Claim
110 words
In an igniter device comprising a centrally disposed high explosive which is linearly encapsulated, the improvement comprising a linear distribution of metal cladded pyrotechnic material about said encapsulation and in intimate contact therewith, wherein said pyrotechnic material includes an oxidizing agent combined with a simple decahydrodecaborate salt, having the common anion B 10 H 10 -2 wherein the cation is selected from the group consisting of: i. tetramethylammonium (CH 3 ) 4 N+, tetraethylammonium (CH 3 CH 2 ) 4 N+, and quaternary ammonium cations having the general formula R 4 N+ where R is an alkyl radical; ii. pyridinium, bipyridinium aryl-diazonium, aryl containing cations and substituted aryl containing cations.
Claim 4
Dependent Claim
110 words
In an igniter device comprising a centrally disposed high explosive which is linearly encapsulated, the improvement comprising a linear distribution of metal cladded pyrotechnic material about said encapsulation and in intimate contact therewith, wherein said pyrotechnic material includes an oxidizing agent combined with a simple decahydrodecaborate salt, having the common anion B 10 H 10 -2 wherein the cation is selected from the group consisting of: i. tetramethylammonium (CH 3 ) 4 N+, tetraethylammonium (CH 3 CH 2 ) 4 N+, and quaternary ammonium cations having the general formula R 4 N+ where R is an alkyl radical; ii. pyridinium, bipyridinium aryl-diazonium, aryl containing cations and substituted aryl containing cations.
Claim 5
Dependent Claim
78 words
In an igniter device comprising a centrally disposed high explosive which is linearly encapsulated, the improvement comprising a linear distribution of metal cladded pyrotechnic material about said encapsulation and in intimate contact therewith, wherein said pyrotechnic material includes an oxidizing agent combined with a simple decahydrodecaborate salt, having the anion B 10 H 10 -2 , wherein the cation is guanidinium, and the salt has the formula (C(NH 2 ) 3 ) 2 B 10 H 10 .
Claim 6
Dependent Claim
78 words
In an igniter device comprising a centrally disposed high explosive which is linearly encapsulated, the improvement comprising a linear distribution of metal cladded pyrotechnic material about said encapsulation and in intimate contact therewith, wherein said pyrotechnic material includes an oxidizing agent combined with a simple decahydrodecaborate salt, having the anion B 10 H 10 -2 , wherein the cation is guanidinium, and the salt has the formula (C(NH 2 ) 3 ) 2 B 10 H 10 .
Claim 7
Dependent Claim
107 words
In an igniter device comprising a centrally disposed high explosive which is linearly encapsulated, the improvement comprising a linear distribution of metal cladded pyrotechnic material about said encapsulation and in intimate contact therewith, wherein said pyrotechnic material includes an oxidizing agent combined with a simple metallic decahydrodecaborate salt, having the common anion B 10 H 10 -2 , wherein the cation is selected from the group consisting of: i. metal ions derived from the elements in Groups 1, 2, 8, 3b, 4b, 5b, 6b, 7b, and the elements of Groups 3a, 4a, 5a, and 6a which have atomic numbers respectively greater than 5, 14, 33 and 52.
Claim 8
Dependent Claim
107 words
In an igniter device comprising a centrally disposed high explosive which is linearly encapsulated, the improvement comprising a linear distribution of metal cladded pyrotechnic material about said encapsulation and in intimate contact therewith, wherein said pyrotechnic material includes an oxidizing agent combined with a simple metallic decahydrodecaborate salt, having the common anion B 10 H 10 -2 , wherein the cation is selected from the group consisting of: i. metal ions derived from the elements in Groups 1, 2, 8, 3b, 4b, 5b, 6b, 7b, and the elements of Groups 3a, 4a, 5a, and 6a which have atomic numbers respectively greater than 5, 14, 33 and 52.
Claim 9
Dependent Claim
65 words
An igniter device as in claim 1 wherein said device has a final configuration which is the resultant product of a process wherein an initial cross-sectional area of said igniter is radially reduced by a mechanical forming step which compacts said metal cladding radially inwardly to define a final cross-sectional area for said device which is reduced approximately 10-60 percent from said initial cross-sectional area.
Claim 10
Dependent Claim
41 words
An igniter device as in claim 5 wherein said metal cladding on said pyrotechnic is one selected from the group consisting of lead, aluminum and silver, and said simple decahydrodecaborate salt selected comprises approximately 6-30% by weight of said pyrotechnic material.
Claim 11
Dependent Claim
41 words
An igniter device as in claim 6 wherein said centrally disposed high explosive is selected from the group consisting of cyclotrimethylenetrinitramine (RDX), cyclotetramethylenetetranitramine (beta-HMX), pentaerythritol (PETN), hexanitrostilbene (HNS), and dipicramid (DIPAM), and said linear encapsulation comprises a sheath around said explosive.
Claim 12
Dependent Claim
60 words
An igniter device as in claim 7 wherein said high explosive sheath, and said metal cladding on said pyrotechnic material, are of lead, and said detonating cord has a distribution of high explosive of between approximately 2 to 6 grains per lineal foot and a mass ratio of lead to high explosive of between approximately 50 to 12, by weight.
Claim 13
Dependent Claim
49 words
An igniter device as in claim 5 wherein said pyrotechnic material includes an oxidizer selected from the group consisting of ammonium nitrate, potassium nitrate, potassium perchlorate, ammonium perchlorate, guanidine nitrate, triaminoguanidine nitrate, potassium permanganate, sodium chromate, barium nitrate, barium chromate, barium manganate, sodium dichromate, tetramethylammonium nitrate and cesium nitrate.
Claim 14
Dependent Claim
50 words
An igniter device as in claim 5 wherein said device further comprises a plurality of individual metal-clad pyrotechnic cords concentrically arranged about, and linearly extending along, said encapsulated explosive wherein said individual metal clad pyrotechnic cords are fused into a metallic matrix around said high explosive by said forming step.
Claim 15
Dependent Claim
138 words
An igniter device as in claim 5 wherein said pyrotechnic material is further the resultant product of a coprecipitation of one of said group of simple decahydrodecaborate salts, and said solid oxidizing agent, by the process of: i. dissolving both the decahydrodecaborate (-2) salt and the solid oxidizing agent in a mutually soluble solvent, at a temperature sufficiently high to maintain said salt and said oxidizing agent in solution; ii. forming a pressurized stream of said solution and brining said solution stream together with a pressurized stream of a miscible nonsolvent, under conditions of extreme turbulence within a mixing chamber, to effect a substantially complete coprecipitation; iii. recovering the coprecipitated product by filtering the effluent from said mixing chamber, and washing said product with an inert and nonsolvent fluid; iv. drying the product to remove all remaining liquid.
Claim 16
Dependent Claim
48 words
An igniter device as in claim 11 wherein said coprecipitated oxidizing agent is selected from the group consisting of ammonium nitrate, potassium nitrate, potassium perchlorate, ammonium perchlorate, guanidine nitrate, triaminoguanidine nitrate, potassium permanganate, sodium chromate, barium nitrate, barium chromate, barium manganate, sodium dichromate, tetramethylammonium nitrate and cesium nitrate.
Claim 17
Dependent Claim
50 words
An igniter device as in claim 12 wherein said device further comprises a plurality of individual metal-clad pyrotechnic cords concentrically arranged about, and linearly extending along, said encapsulated explosive wherein said individual metal clad pyrotechnic cords are fused into a metallic matrix around said high explosive by said forming step.
Claim 18
Dependent Claim
20 words
An igniter device as in claim 10 wherein said plurality of metal clad pyrotechnic cords is between 3 and 13.
Claim 19
Dependent Claim
20 words
An igniter device as in claim 13 wherein said plurality of metal clad pyrotechnic cords is between 3 and 13.
Claim 20
Dependent Claim
106 words
An igniter device as in claim 14 wherein said linear encapsulation comprises an outer sheath, and said sheath and said metal cladding on each of said pyrotechnic cords are of lead, wherein further said detonating cord has a distribution of high explosive of between approximately 2 to 6 grains per lineal foot and a mass ratio of lead to high explosive of between approximately 50 to 12, by weight, and each protechnic cord has a distribution of said pyrotechnic of between approximately 3 to 80 grains per lineal foot and a mass ratio of lead to pyrotechnic material of between approximately 3 to 35, by weight.
Claim 21
Dependent Claim
27 words
An igniter device as in claim 6 wherein said centrally disposed and linearly encapsulated explosive comprises a flexible extended cord of explosive particles within a viscoelastic binder.
Claim 22
Dependent Claim
26 words
An igniter device as in claim 17 wherein said flexible extruded cord further includes an additional sheathing defined by a separate outer layer of plastic material.
Claim 23
Dependent Claim
30 words
An igniter device as in claim 6 wherein said initial cross section of said igniter is further defined by an additional layer of an encapsulating material as an outer covering.
Claim 24
Dependent Claim
65 words
An igniter device as in claim 2 wherein said device has a final configuration which is the resultant product of a process wherein an initial cross-sectional area of said igniter is radially reduced by a mechanical forming step which compacts said metal cladding radially inwardly to define a final cross-sectional area for said device which is reduced approximately 10-60 percent from said initial cross-sectional area.
Claim 25
Dependent Claim
61 words
An igniter device as in claim 20 wherein said metal cladding on said pyrotechnic is one selected from the group consisting of lead, aluminum and silver, and said simple decahydrodecaborate salt selected comprises approximately 6-30% by weight of said pyrotechnic material, and the cation is further selected from the group consisting of tetramethyl ammonium, tetra ethyl ammonium, pyridinium and aryl-diazonium cations.
Claim 26
Dependent Claim
41 words
An igniter device as in claim 21 wherein said centrally disposed high explosive is selected from the group consisting of cyclotrimethylenetrinitramine (RDX), cyclotetramethylenetetranitramine (beta-HMX), pentaerythritol (PETN), hexanitrostilbene (HNS), and dipicramid (DIPAM), and said linear encapsulation comprises a sheath around said explosive.
Claim 27
Dependent Claim
60 words
An igniter device as in claim 22 wherein said high explosive sheath, and said metal cladding on said pyrotechnic material, are of lead, and said detonating cord has a distribution of high explosive of between approximately 2 to 6 grams per lineal foot and a mass ratio of lead to high explosive of between approximately 50 to 12, by weight.
Claim 28
Dependent Claim
49 words
An igniter device as in claim 20 wherein said pyrotechnic material includes an oxidizer selected from the group consisting of ammonium nitrate, potassium nitrate, potassium perchlorate, ammonium perchlorate, guanidine nitrate, triaminoguanidine nitrate, potassium permanganate, sodium chromate, barium nitrate, barium chromate, barium manganate, sodium dichromate, tetramethylammonium nitrate and cesium nitrate.
Claim 29
Dependent Claim
50 words
An igniter device as in claim 20 wherein said device further comprises a plurality of individual metal-clad pyrotechnic cords concentrically arranged about, and linearly extending along, said encapsulated explosive wherein said individual metal clad pyrotechnic cords are fused into a metallic matrix around said high explosive by said forming step.
Claim 30
Dependent Claim
138 words
An igniter device as in claim 20 wherein said pyrotechnic material is further the resultant product of a coprecipitation of one of said group of simple decahydrodecarbonate salts, and said solid oxidizing agent, by the process of: i. dissolving both the decahydrodecaborate (-2) salt and the solid oxidizing agent in a mutually soluble solvent, at a temperature sufficiently high to maintain said salt and said oxidizing agent in solution; ii. forming a pressurized stream of said solution and brining said solution stream together with a pressurized stream of a miscible nonsolvent, under conditions of extreme turbulence within a mixing chamber, to effect a substantially complete coprecipitation; iii. recovering the coprecipitated product by filtering the effluent from said mixing chamber, and washing said product with an inert and nonsolvent fluid; iv. drying the product to remove all remaining liquid.
Claim 31
Dependent Claim
48 words
An igniter device as in claim 26 wherein said coprecipitated oxidizing agent is selected from the group consisting of ammonium nitrate, potassium nitrate, potassium perchlorate, ammonium perchlorate, guanidine nitrate, triaminoguanidine nitrate, potassium permanganate, sodium chromate, barium nitrate, barium chromate, barium manganate, sodium dichromate, tetramethylammonium nitrate and cesium nitrate.
Claim 32
Dependent Claim
50 words
An igniter device as in claim 27 wherein said device further comprises a plurality of individual metal-clad pyrotechnic cords concentrically arranged about, and linearly extending along, said encapsulated explosive wherein said individual metal clad pyrotechnic cords are fused into a metallic matrix around said high explosive by said forming step.
Claim 33
Dependent Claim
20 words
An igniter device as in claim 25 wherein said plurality of metal clad pyrotechnic cords is between 3 and 13.
Claim 34
Dependent Claim
20 words
An igniter device as in claim 28 wherein said plurality of metal clad pyrotechnic cords is between 3 and 13.
Claim 35
Dependent Claim
102 words
An igniter device as in claim 29 wherein said linear encapsulation comprises an outer sheath, and said metal cladding on each of said pyrotechnic cords, are of lead, wherein further said detonating cord has a distribution of high explosive of between approximately 2 to 6 grains per lineal foot and a mass ratio of lead to high explosive of between approximately 50 to 12, by weight, each pyrotechnic cord has a distribution of said pyrotechnic of between approximately 33 to 80 grains per lineal foot and a mass ratio of lead to pyrotechnic material of between approximately 8 to 35, by weight.
Claim 36
Dependent Claim
27 words
An igniter device as in claim 21 wherein said centrally disposed and linearly encapsulated explosive comprises a flexible extruded cord of explosive particles within a viscoelastic binder.
Claim 37
Dependent Claim
26 words
An igniter device as in claim 32 wherein said flexible extruded cord further includes an additional sheathing defined by a separate outer layer of plastic material.
Claim 38
Dependent Claim
30 words
An igniter device as in claim 21 wherein said initial cross section of said igniter is further defined by an additional layer of an encapsulating material as an outer covering.
Claim 39
Dependent Claim
65 words
An igniter device as in claim 3 wherein said device has a final configuration which is the resultant product of a process wherein an initial cross-sectional area of said igniter is radially reduced by a mechanical forming step which compacts said metal cladding radially inwardly to define a final cross-sectional area for said device which is reduced approximately 10-60 percent from said initial cross-sectional area.
Claim 40
Dependent Claim
41 words
An igniter device as in claim 35 wherein said metal cladding on said pyrotechnic is one selected from the group consisting of lead, aluminum and silver, and said simple decahydrodecaborate salt selected comprises approximately 6-30% by weight of said pyrotechnic material.
Claim 41
Dependent Claim
41 words
An igniter device as in claim 36 wherein said centrally disposed high explosive is selected from the group consisting of cyclotrimethylenetrinitramine (RDX), cyclotetramethylenetetranitramine (beta-HMX), pentaerythritol (PETN), hexanitrostilbene (HNS), and dipicramid (DIPAM), and said linear encapsulation comprises a sheath around said explosive.
Claim 42
Dependent Claim
60 words
An igniter device as in claim 37 wherein said high explosive sheath, and said metal cladding on said pyrotechnic material, are of lead, and said detonating cord has a distribution of high explosive of between approximately 2 to 6 grains per lineal foot and a mass ratio of lead to high explosive of between approximately 50 to 12, by weight.
Claim 43
Dependent Claim
49 words
An igniter device as in claim 35 wherein said pyrotechnic material includes an oxidizer selected from the group consisting of ammonium nitrate, potassium nitrate, potassium perchlorate, ammonium perchlorate, guanidine nitrate, triaminoguanidine nitrate, potassium permanganate, sodium chromate, barium nitrate, barium chromate, barium manganate, sodium dichromate, tetramethylammonium nitrate and cesium nitrate.
Claim 44
Dependent Claim
50 words
An igniter device as in claim 35 wherein said device further comprises a plurality of individual metal-clad pyrotechnic cords concentrically arranged about, and linearly extending along, said encapsulated explosive wherein said individual metal clad pyrotechnic cords are fused into a metallic matrix around said high explosive by said forming step.
Claim 45
Dependent Claim
138 words
An igniter device as in claim 35 wherein said pyrotechnic material is further the resultant product of a coprecipitation of one of said group of simple decahydrodecaborate salts, and said solid oxidizing agent, by the process of: i. dissolving both the decahydrodecaborate (-2) salt and the solid oxidizing agent in a mutually soluble solvent, at a temperature sufficiently high to maintain said salt and said oxidizing agent in solution; ii. forming a pressurized stream of said solution and brining said solution stream together with a pressurized stream of a miscible nonsolvent, under conditions of extreme turbulence within a mixing chamber, to effect a substantially complete coprecipitation; iii. recovering the coprecipitated product by filtering the effluent from said mixing chamber, and washing said product with an inert and nonsolvent fluid; iv. drying the product to remove all remaining liquid.
Claim 46
Dependent Claim
48 words
An igniter device as in claim 41 wherein said coprecipitated oxidizing agent is selected from the group consisting of ammonium nitrate, potassium nitrate, potassium perchlorate, ammonium perchlorate, guanidine nitrate, triaminoguanidine nitrate, potassium permanganate, sodium chromate, barium nitrate, barium chromate, barium manganate, sodium dichromate, tetramethylammonium nitrate and cesium nitrate.
Claim 47
Dependent Claim
50 words
An igniter device as in claim 42 wherein said device further comprises a plurality of individual metal-clad pyrotechnic cords concentrically arranged about, and linearly extending along, said encapsulated explosive wherein said individual metal clad pyrotechnic cords are fused into a metallic matrix around said high explosive by said forming step.
Claim 48
Dependent Claim
20 words
An igniter device as in claim 40 wherein said plurality of metal clad pyrotechnic cords is between 3 and 13.
Claim 49
Dependent Claim
20 words
An igniter device as in claim 43 wherein said plurality of metal clad pyrotechnic cords is between 3 and 13.
Claim 50
Dependent Claim
104 words
An igniter device as in claim 44 wherein said linear encapsulation comprises an outer said sheath and said metal cladding on each of said pyrotechnic cords, are of lead, wherein further said detonating cord has a distribution of high explosive of between approximately 2 to 6 grains per lineal foot and a mass ratio of lead to high explosive of between approximately 50 to 12, by weight, and each pyrotechnic cord has a distribution of said pyrotechnic of between approximately 3 to 80 grains per lineal foot and a mass ratio of lead to pyrotechnic material of between approximately 8 to 35, by weight.
Claim 51
Dependent Claim
28 words
An igniter device as in claim 36 wherein said centrally explosive disposed and linearly encapsulated explosive comprises a flexible extruded cord of explosive particles within a viscoelastic binder.
Claim 52
Dependent Claim
26 words
An igniter device as in claim 47 wherein said flexible extruded cord further includes an additional sheathing defined by a separate outer layer of plastic material.
Claim 53
Dependent Claim
30 words
An igniter device as in claim 36 wherein said initial cross section of said igniter is further defined by an additional layer of an ecapsulating material as an outer covering.
Claim 54
Dependent Claim
65 words
An igniter device as in claim 4 wherein said device has a final configuration which is the resultant product of a process wherein an initial cross-sectional area of said igniter is radially reduced by a mechanical forming step which compacts said metal cladding radially inwardly to define a final cross-sectional area for said device which is reduced approximately 10-60 percent from said initial cross-sectional area.
Claim 55
Dependent Claim
66 words
An igniter device as in claim 50 wherein said metal cladding on said pyrotechnic is one selected from the group consisting of lead, aluminum and silver, wherein the metallic salt is selected from the group consisting of cesium decahydrodecaborate, Cs 2 B 10 H 10 , and potassium decahydrodecaborate, K 2 B 10 H 10 , and comprises approximately 6-30% by weight of said pyrotechnic material.
Claim 56
Dependent Claim
41 words
An igniter device as in claim 51 wherein said centrally disposed high explosive is selected from the group consisting of cyclotrimethylenetrinitramine (RDX), cyclotetramethylenetetranitramine (beta-HMX), pentaerythritol (PETN), hexanitrostilbene (HNS), and dipicramid (DIPAM), and said linear encapsulation comprises a sheath around said explosive.
Claim 57
Dependent Claim
60 words
An igniter device as in claim 52 wherein said high explosive sheath, and said metal cladding on said pyrotechnic material, are of lead, and said detonating cord has a distribution of high explosive of between approximately 2 to 6 grains per lineal foot and a mass ratio of lead to high explosive of between approximately 50 to 12, by weight.
Claim 58
Dependent Claim
49 words
An igniter device as in claim 50 wherein said pyrotechnic material includes an oxidizer selected from the group consisting of ammonium nitrate, potassium nitrate, potassium perchlorate, ammonium perchlorate, guanidine nitrate, triaminoguanidine nitrate, potassium permanganate, sodium chromate, barium nitrate, barium chromate, barium manganate, sodium dichromate, tetrametylammonium nitrate and cesium nitrate.
Claim 59
Dependent Claim
50 words
An igniter device as in claim 50 wherein said device further comprises a plurality of individual metal-clad pyrotechnic cords concentrically arranged about, and linearly extending along, said encapsulated explosive wherein said individual metal clad pyrotechnic cords are fused into a metallic matrix around said high explosive by said forming step.
Claim 60
Dependent Claim
138 words
An igniter device as in claim 50 wherein said pyrotechnic material is further the resultant product of a coprecipitation of one of said group of simple decahydrodecaborate salts, and said solid oxidizing agent, by the process of: i. dissolving both the decahydrodecaborate (-2) salt and the solid oxidizing agent in a mutaully soluble solvent, at a temperature sufficiently high to maintain said salt and said oxidizing agent in solution; ii. forming a pressurized stream of said solution and brining said solution stream together with a pressurized stream of a miscible nonsolvent, under conditions of extreme turbulence within a mixing chamber, to effect a substantially complete coprecipitation; iii. recovering the coprecipitated product by filtering the effluent from said mixing chamber, and washing said product with an inert and nonsolvent fluid; iv. drying the product to remove all remaining liquid.
Claim 61
Dependent Claim
48 words
An igniter device as in claim 56 wherein said coprecipitated oxidizing agent is selected from the group consisting of ammonium nitrate, potassium nitrate, potassium perchlorate, ammonium perchlorate, guanidine nitrate, triaminoguanidine nitrate, potassium permanganate, sodium chromate, barium nitrate, barium chromate, barium manganate, sodium dichromate, tetramethylammonium nitrate and cesium nitrate.
Claim 62
Dependent Claim
50 words
An igniter device as in claim 57 wherein said device further comprises a plurality of individual metal-clad pyrotechnic cords concentrically arranged about, and linearly extending along, said encapsulated explosive wherein said individual metal clad pyrotechnic cords are fused into a metallic matrix around said high explosive by said forming step.
Claim 63
Dependent Claim
20 words
An igniter device as in claim 55 wherein said plurality of metal clad pyrotechnic cords is between 3 and 13.
Claim 64
Dependent Claim
20 words
An igniter device as in claim 58 wherein said plurality of metal clad pyrotechnic cords is between 3 and 13.
Claim 65
Dependent Claim
105 words
An igniter device as in claim 59 wherein said linear encapsulation comprises an outer sheath, and said sheath and said metal cladding on each of said pyrotechnic cords, are of lead, wherein further said detonating cord has a distribution of high explosive of between approximately 2 to 6 grains per lineal foot and a mass ratio of lead to high explosive of between approximately 50 to 12, by weight, each pyrotechnic cord has a distribution of said pyrotechnic of between approximately 3 to 80 grains per lineal foot and a mass ratio of lead to pyrotechnic material of between approximately 8 to 35, by weight.
Claim 66
Dependent Claim
27 words
An igniter device as in claim 51 wherein said centrally disposed and linearly encapsulated explosive comprises a flexible extruded cord of explosive particles within a viscoelastic binder.
Claim 67
Dependent Claim
26 words
An igniter device as in claim 62 wherein said flexible extruded cord further includes an additional sheathing defined by a separate outer layer of plastic material.
Claim 68
Dependent Claim
30 words
An igniter device as in claim 51 wherein said initial cross section of said igniter is further defined by an additional layer of an encapsulating material as an outer covering.
References Cited (Backward Citations)
US3041914A
Cited
US3107613A
Cited
US3320882A
Cited
US3903800A
Cited
US3389659A
Cited
US3667391A
Cited
US3851586A
Cited
US3945322A
Cited
US4024817A
Cited
US4023493A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-27 | 1981-09-26 | 1982-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-27 | 1985-09-26 | 1986-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-27 | 1989-09-26 | 1990-03-28 | $7700.00 | Window Closed / Lapsed |