US3698280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of detonating fuse cord
Assignee: Canadian Safety Fuse Co Ltd
•
Filing: 1970-01-19
•
Granted: 1972-10-17
•
Expires: 1990-01-19
Abstract
Abstract A method of manufacturing a detonating cord having a dual explosive core is described. The total quantity of explosive in the dual core varies along the length of the cord and the product is useful in metal expansion operations.
Inventors
- 👤 David Martin Welsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:31
CPC Classifications
C; C06; C06C; C06C5/00; C06C5/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
138 words
A method of producing a dual core detonating fuse cord having along its length regular alternating sections of different potential energy outputs comprising the steps of: a. continuously forming a first braided textile stocking; b. ejecting a stream comprised of regularly alternating portions of slurried particulate explosive and slurried particulate inert non-explosive through an orifice in a continuous column into said first textile stocking; c. drying the filled, first braided, textile stocking; d. continuously forming a second braided textile stocking; e. ejecting a stream of slurried particulate explosive through an orifice into a continuous column into said second textile stocking; f. drying the filled, second braided, textile stocking; g. wrapping together in side-by-side, linear relationship said filled, first and second textile stockings to form a dual cord; and h. covering the wrapped dual cord with a protective sheath.
Claim 2
Independent Claim
138 words
A method of producing a dual core detonating fuse cord having along its length regular alternating sections of different potential energy outputs comprising the steps of: a. continuously forming a first braided textile stocking; b. ejecting a stream comprised of regularly alternating portions of slurried particulate explosive and slurried particulate inert non-explosive through an orifice in a continuous column into said first textile stocking; c. drying the filled, first braided, textile stocking; d. continuously forming a second braided textile stocking; e. ejecting a stream of slurried particulate explosive through an orifice into a continuous column into said second textile stocking; f. drying the filled, second braided, textile stocking; g. wrapping together in side-by-side, linear relationship said filled, first and second textile stockings to form a dual cord; and h. covering the wrapped dual cord with a protective sheath.
Claim 3
Dependent Claim
23 words
A method as claimed in claim 1 where a void is substituted for the slurried particulate non-explosive in the said first textile stocking.
Claim 4
Dependent Claim
20 words
A meThod as claimed in claim 1 wherein the streams of slurried explosive and non-explosive are ejected by pneumatic force.
Claim 5
Dependent Claim
32 words
A method as claimed in claim 1 wherein the particulate explosive is selected from the group consisting of pentaerythritoltetranitrate, cyclotrimethylenetrinitramine, nitromannite, lead azide, trinitrotoluene, cyclotrhylenetetranitramine, lead styphnate, tetryl and mixtures of these.
Claim 6
Dependent Claim
27 words
A method as claimed in claim 1 wherein the particulate inert non-explosive is selected from the group of particulate thermoplastics, water-insoluble inorganic salts and water-insoluble organic salts.
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) | 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 |