US3640222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Booster-cap assembly
Assignee: Ireco Inc
•
Filing: 1968-12-27
•
Granted: 1972-02-08
•
Expires: 1988-12-27
Abstract
Abstract A booster unit containing a small base charge, and adapted to slip over the end of a cap-, or fuse-, type primary initiator to support the base charge in detonating relationship with the primary initiator; and resulting combination of booster unit and the primary initiator as a new booster assembly. The invention is advantageously applied to the elimination of need for conventional dynamite, or cast booster charge, primers for shooting relatively insensitive explosives such as those of the aqueous inorganic oxidizer slurry types, and ANFO''s.
Inventors
- 👤 Donald P Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:39
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/10; F42B3/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
15 words
A booster assembly of claim 1 wherein said primary initiator is an electric blasting cap.
Claim 2
Dependent Claim
20 words
A booster assembly of claim 1 wherein said primary initiator is a fuse cap, and a detonating fuse element therefor.
Claim 3
Dependent Claim
31 words
A booster assembly of claim 1 wherein said shell of a circuLar cross section from 2 to 5 inches in length and from 0.2 to 0.4 inch in diametric cross section.
Claim 4
Dependent Claim
28 words
A booster assembly of claim 4 wherein said high explosive charge in said booster unit is PETN compressed to a density of at least 1.3 gram per cc.
Claim 5
Dependent Claim
14 words
A booster assembly of claim 1 wherein said primary initiator contains a delay fuse.
Claim 6
Dependent Claim
53 words
A booster assembly of claim 5 wherein said booster shell is about 2 1/8 inches in length by 0.3 inch in diameter, and wherein said high explosive is about 1 gram of PETN compressed to a shell length of about five-eighths inch, thereby allowing 1 1/2 inch for support of said primary initiator.
Claim 7
Dependent Claim
47 words
A booster assembly of claim 5 wherein said booster unit shell is about 2 5/8 inches in length, and said high explosive charge is about 2 grams of PETN pressed to about 1 1/4 inches, thereby allowing about 1 3/8 inches for support of said primary initiator.
Claim 8
Dependent Claim
25 words
A booster assembly of claim 1 wherein from about one-fourth to five-eighths of the length of the booster shell is charged with said high explosive.
Claim 9
Dependent Claim
27 words
A booster assembly of claim 9 wherein the column of said high explosive charge is in the order of about one-half the length of the booster shell.
Claim 10
Dependent Claim
16 words
A booster assembly of claim 1 wherein said elongated booster shell is of circular cross section.
Claim 11
Dependent Claim
42 words
A booster assembly of claim 1 wherein each of said open and closed end sections of said elongated shell is of circular cross section, and said open end section has a greater diametric cross section than that of said closed end section.
Claim 12
Dependent Claim
168 words
A booster assembly comprising a booster unit slipped onto a cap-, or fuse-, type primary initiator, comprising, as said booster unit, an elongated shell open at one end and closed at the other end, from 1 to 6 grams secondary high explosive within, and completely filling, a closed end section of said shell, and the remaining section of said shell being open and unobstructed; said primary initiator having an external transverse cross section sufficiently less than, and correlated with, the internal transverse cross section of said open end shell section so as to permit at least an end portion of said initiator to be coaxially disposed within said open end shell section in force fit closing relationship with said shell along substantially the entire external primary initiator surface within said shell; and said booster unit, at its open end, coaxially slipped in said force fit on to at least an end portion of said primary initiator with said secondary high explosive in detonating relationship with said primary initiator.
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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |