US4660474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Percussion or impact wave conductor unit
Assignee: BRITANITE INDUSTRIAS QUIMICAS LTDA BR 116 KM 71 QUATRO BARRAS CUITIBA PARANA BRAZIL A BRAZILIAN Co
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Filing: 1985-01-14
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Granted: 1987-04-28
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Expires: 2005-01-14
Abstract
Abstract A device for application in the art of blasting, by the use of nonelectric devices, and the new concept that employs pyrotechnic mixtures and combinations thereof which are distributed in granular form throughout the inside of a supporting tube. The pyrotechnic mixture applied to the supporting tube having been subjected to a suitable mixing process to ensure cohesive properties so that the mixture will adhere in the proper manner to the inside surface of the supporting tube, and will allow for great flexibility in the density of the surface charge, in addition to allowing for the use of a vast range of chemical substances, as well as the secondary use of these devices as retarder units.
Inventors
- 👤 Danilo A. Dias dos Santos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:25
CPC Classifications
C; C06; C06C; C06C5/00; F; F42; F42B; F42B3/00; F42B3/10; F42B3/11
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
40 words
A non-electric fuse device for initiating explosives comprising: an elongated hollow duct having entrace and exit ends and an inner annulus having a dimension of from about 0.5 mm to about 10 mm, and containing on the interior surface thereof;
Claim 2
Dependent Claim
40 words
A non-electric fuse device for initiating explosives comprising: an elongated hollow duct having entrace and exit ends and an inner annulus having a dimension of from about 0.5 mm to about 10 mm, and containing on the interior surface thereof;
Claim 3
Dependent Claim
125 words
a coating, comprising a pyrotechnic mixture made up of at least three members selected from the group consisting of potassium bichromate, vanadium pentoxide potassium permanganate, sugar, lead oxide, aluminum, silicon and amorphous boron and combination thereof which when present in said coating are bonded to the said inner surface of said hollow duct; said coating mixture having a coverage of from between about 1×10 -2 to about 4×10 -5 gm/cm 2 and a burn rate when fired at said entrance end of from between about 500 meters per second to about 1200 meters per second along the interior of said duct whereby explosives placed at said exit end of said duct can be initiated by the products of said pyrotechnic combustion leaving said exit end.
Claim 4
Dependent Claim
125 words
a coating, comprising a pyrotechnic mixture made up of at least three members selected from the group consisting of potassium bichromate, vanadium pentoxide potassium permanganate, sugar, lead oxide, aluminum, silicon and amorphous boron and combination thereof which when present in said coating are bonded to the said inner surface of said hollow duct; said coating mixture having a coverage of from between about 1×10 -2 to about 4×10 -5 gm/cm 2 and a burn rate when fired at said entrance end of from between about 500 meters per second to about 1200 meters per second along the interior of said duct whereby explosives placed at said exit end of said duct can be initiated by the products of said pyrotechnic combustion leaving said exit end.
References Cited (Backward Citations)
US3590739A
Cited
US3730096A
Cited
US4080902A
Cited
US4328753A
Cited
US4290366A
Cited
US4493261A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-27 | 1990-10-27 | 1991-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-27 | 1994-10-27 | 1995-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-27 | 1998-10-27 | 1999-04-28 | $7700.00 | Window Closed / Lapsed |