US4063510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for detecting a misfired explosive
Assignee: Taisei Corp
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Filing: 1976-08-16
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Granted: 1977-12-20
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Expires: 1996-08-16
Abstract
Abstract A process for indirectly detecting a misfired explosive (cartridge) which comprises charging a ferrite magnet as a tracer in an explosive charging portion together with an explosive in a blasting method and detecting the magnetic flux of said magnet charged in a misfired explosive cartridge at a site of explosion after blasting by a magnet measuring instrument, characterized by using as said tracer a ferrite magnet calcined at a temperature less than 1000 DEG C. and detecting this magnet by said magnetic detector.
Inventors
- 👤 Yasuo Ishii
- 👤 Naozumi Nishimura
- 👤 Kohei Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:50
CPC Classifications
F; F42; F42D; F42D5/00; F42D5/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
82 words
A process for indirectly detecting a misfired explosive (cartridge) which comprises charging a ferrite magnet as a tracer in an explosive charging portion together with an explosive in a blasting method and detecting the magnetic flux of said magnet charged in a misfired explosive cartridge at a site of explosion after blasting by a magnet measuring instrument, characterized by using as said tracer a ferrite magnet calcined at a temperature less than 1000° C. and detecting this magnet by said magnetic detector.
Claim 2
Dependent Claim
82 words
A process for indirectly detecting a misfired explosive (cartridge) which comprises charging a ferrite magnet as a tracer in an explosive charging portion together with an explosive in a blasting method and detecting the magnetic flux of said magnet charged in a misfired explosive cartridge at a site of explosion after blasting by a magnet measuring instrument, characterized by using as said tracer a ferrite magnet calcined at a temperature less than 1000° C. and detecting this magnet by said magnetic detector.
Claim 3
Dependent Claim
42 words
A process for indirectly detecting a misfired explosive (cartridge) in a blasting method according to claim 1, wherein a ferrite magnet piece calcined at a temperature less than 1000° C. and formed in a hollow shape is used as said ferrite magnet.
Claim 4
Dependent Claim
19 words
A process according to claim 2, wherein a hollow cylindrical ferrite magnet piece is used as said ferrite magnet.
Claim 5
Dependent Claim
65 words
A process for indirectly a misfired explosive (cartridge) in a blasting method according to claim 1, wherein a magnet for detecting (tracer) which comprises combining a plurality of ferrite magnet pieces calcined at a temperature less than 1000° C. with soft magnetic substance pieces in a rod shape in the direction of the magnetic pole of said ferrite magnet pieces, is used as ferrite magnet.
Claim 6
Dependent Claim
28 words
A process according to claim 4, wherein the respective elements of said ferrite magnet pieces and said soft magnetic substance pieces shaped in a columnar state are used.
Claim 7
Dependent Claim
27 words
A process according to claim 4, wherein the respective elements of said ferrite magnet pieces and said soft magnetic substance pieces in hollow cylindrical shapes are used.
Claim 8
Dependent Claim
34 words
A process according to claim 6, wherein the inner diameters and the outer diameters of the respective elements of hollow cylindrical shapes are made 3 - 4 mm and 10 - 15 mm, respectively.
Claim 9
Dependent Claim
19 words
A process according to claim 4, wherein said magnet pieces for detecting (tracer) are inserted into an explosive cartridge.
Claim 10
Dependent Claim
59 words
A process according to claim 8, wherein, upon inserting said magnet pieces for detecting (tracer) into said explosive cartridge, the ratio of diameters of said magnet pieces for detecting to said explosive cartridge is made 0.3 - 0.5 and the tip of the inserted magnet pieces is made at least 1 cm away from the tip of said cartridge.
Claim 11
Dependent Claim
28 words
A process according to claim 1, wherein ferrite powder calcined at a temperature less than 1000° C, is mixed with said explosive and thereafter said explosive is magnetized.
Claim 12
Dependent Claim
26 words
A process according to claim 10, wherein said ferrite powder is mixed with said explosive in an amount of 3 - 20% based on said explosive.
Claim 13
Dependent Claim
32 words
A process according to claim 1, wherein the distance between two detecting elements disposed on the same axis on a detecting rod in the magnetic detector is made 10 - 30 cm.
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) | 1980-12-19 | 1981-06-20 | 1981-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-19 | 1985-06-20 | 1985-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-19 | 1989-06-20 | 1989-12-20 | $7700.00 | Window Closed / Lapsed |