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US4742773A Expired / Lapsed US ⏱️ 0.0 years remaining

Blasting signal transmission tube delay unit

Assignee: Ensign Bickford Co
•
Filing: 1986-10-03
•
Granted: 1988-05-10
•
Expires: 2006-10-03
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Abstract

Abstract A transmission tube signal delay assembly comprising a delay element containing a shaped delay composition having a preselected combustion time from a first side of the delay element to a second side of the delay element; a first transition element adjacent to the delay element at the first side for transferring a transmission tube signal to the delay element; and a second transition element adjacent to the delay element at the second side for transferring a signal from the delay element to a transmission tube, each of the transition elements comprising a shaped transition composition. Also, a method for delaying a transmission tube signal delay unit having a housing with a plurality of openings for receiving portions of signal transmission tube having interior-exposing opening means for securing the signal transmission tubes in the housing openings; and the signal delay assembly mounted in the housing with each of the transition elements positioned between the delay element and one of the housing openings for transferring a signal between the delay element and each of the signal transmission tubes.

Inventors

  • 👤 Stephen W. Bartholomew
  • 👤 Daniel C. Rontey
  • 👤 William J. Necker
  • 👤 Craig F. Adams

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 22:58
CPC Classifications
F; F42; F42D; F42D1/00; F42D1/04; F42D1/06; C; C06; C06C; C06C5/00; C06C5/06

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 116 words
A transmission tube signal delay assembly comprising: a delay element containing a delay composition having a preselected combustion time from a first side of said delay element to a second side of said delay element; a first transition element abutting said delay element at said first side for transferring a transmission tube signal to said delay element; a second transition element abutting said delay element at said second side for transferring a signal from said delay element to a transmission tube, each of said transition elements, and said delay element being enclosed in a housing having end openings opposite the first and second transition elements and a length of transmission tube secured in each end opening.
Claim 2
Dependent Claim 116 words
A transmission tube signal delay assembly comprising: a delay element containing a delay composition having a preselected combustion time from a first side of said delay element to a second side of said delay element; a first transition element abutting said delay element at said first side for transferring a transmission tube signal to said delay element; a second transition element abutting said delay element at said second side for transferring a signal from said delay element to a transmission tube, each of said transition elements, and said delay element being enclosed in a housing having end openings opposite the first and second transition elements and a length of transmission tube secured in each end opening.
Claim 3
Dependent Claim 83 words
The assembly of claim 1 wherein the transition composition is selected from the group consisting of a mixture of zirconium and potassium perchlorate, a mixture of titanium and potassium perchlorate, a mixture of boron and red lead oxide, a mixture of zirconium and iron oxide, a mixture of zirconium and potassium chlorate, a mixture of zirconium and lead chromate, a mixture of titanium and lead chromate, a mixture of magnesium and barium chromate, a mixture of boron and potassium nitrate, and mixtures thereof.
Claim 4
Dependent Claim 31 words
The unit of claim 1 wherein said securing means comprises a crimpable bushing at each of said housing openings for securing said housing to the exterior of said signal transmission tube.
Claim 5
Dependent Claim 19 words
The unit of claim 1 additionally comprising means for aligning said transmission tube interior-exposing openings with said transition elements.
Claim 6
Dependent Claim 21 words
The unit of claim 4 wherein said alignment means comprises a sleeve insertable in the opening of said signal transmission tube.
Claim 7
Dependent Claim 19 words
The unit of claim 3 wherein said bushings provide an environmental seal between said housing and said transmission tubes.

References Cited (Backward Citations)

US2736263A Cited
GB731108A Cited
US2707438A Cited
US2891476A Cited
US3306201A Cited
US3343487A Cited
US3353485A Cited
US3320884A Cited
US3718095A Cited
US3727552A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1991-05-10 1991-11-09 1992-05-10 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1995-05-10 1995-11-09 1996-05-10 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1999-05-10 1999-11-09 2000-05-10 $7700.00 Window Closed / Lapsed

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