US4949645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High density materials and products
Assignee: BAE Systems Operations Ltd
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Filing: 1988-05-12
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Granted: 1990-08-21
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Expires: 2008-05-12
Abstract
Abstract High density materials, e.g. for fishing weights or pellets or shot as ammunition, are composed of a material comprising high-density metal particles in particular tungsten-containing particles, in a settable or hardenable polymeric matrix providing a composite material of stable configuration. Fishing weights may be produced in known forms, or as flexible tubing to be cut to size by the user, or as a hinged pair of body parts which can be closed together to grip a line between them and to be reopened. For pellets or shot similar materials comprising a polymeric matrix can be provided, or such products can be pressed directly from a tungsten alloy. These products all offer particular advantages of non-toxicity, and the fishing weights can be given the ability to be re-used many times.
Inventors
- 👤 Andrew C. Hayward
- 👤 Melvyn E. Slater
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:36
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/14; B29C45/14549; B29C45/14565; A; A01; A01K; A01K95/00; A01K95/005; C; C08; C08K; C08K3/00; C08K3/02; C08K3/08; C22; C22C; C22C27/00; C22C27/04; F; F42; F42B; F42B7/00; F42B7/02; F42B7/04; F42B7/046; B29K; B29K2503/00; B29K2503/04; B29K2503/06
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
32 words
A shotgun pellet or shotgun shot for use in a shotgun cartridge, said shotgun pellet or shotgun shot being formed from a tungsten-rich material that comprises tungsten and a settable plastics material.
Claim 2
Dependent Claim
32 words
A shotgun pellet or shotgun shot for use in a shotgun cartridge, said shotgun pellet or shotgun shot being formed from a tungsten-rich material that comprises tungsten and a settable plastics material.
Claim 3
Dependent Claim
29 words
A shotgun pellet or shotgun shot according to claim 1, wherein said tungsten-rich material includes a tungsten alloy having a tungsten content of between 40% and 97% by weight.
Claim 4
Dependent Claim
18 words
A shotgun pellet or shotgun shot according to claim 2 containing between 50% and 90% tungsten by weight.
Claim 5
Dependent Claim
37 words
A shotgun pellet or shotgun shot according to claim 2, wherein the tungsten-rich material includes an alloy of tungsten that contains an alloying constituent selected from the group of (i) nickel, (ii) copper, (iii) nickel and copper.
Claim 6
Dependent Claim
27 words
A shotgun pellet or shotgun shot according to claim 4, wherein the alloy of tungsten includes 90% tungsten by weight with the remainder being said alloying constituent.
Claim 7
Dependent Claim
27 words
A shotgun pellet or shotgun shot according to claim 4, wherein the alloy of tungsten includes 70% tungsten by weight with the remainder being said alloying constituent.
Claim 8
Dependent Claim
27 words
A shotgun pellet or shotgun shot according to claim 4, wherein the alloy of tungsten includes 50% tungsten by weight with the remainder being said alloying constituent.
Claim 9
Dependent Claim
17 words
A shotgun pellet or shotgun shot according to claim 1, wherein the plastics matrix is silicone rubber.
Claim 10
Dependent Claim
28 words
A shotgun pellet or shotgun shot according to claim 1, wherein the particles are at least of a size as to be retained by a 100 mesh sieve.
Claim 11
Dependent Claim
39 words
A shotgun pellet or shotgun shot according to claim 1, wherein the relative amounts of tungsten and the material lighter than lead result in a tungsten-rich material having a density at least substantially equal to that of a lead.
Claim 12
Dependent Claim
27 words
The shotgun pellet or shotgun shot according to claim 1, wherein the density of the shotgun pellet or shotgun shot is greater than the density of lead.
Claim 13
Dependent Claim
25 words
The shotgun pellet or shotgun shot according to claim 1, wherein the density of the shotgun pellet or shotgun shot is substantially equal to lead.
Claim 14
Dependent Claim
37 words
A shotgun cartridge containing a charge of a propellant together with shot formed from a tungsten-rich material that comprises tungsten and a non-toxic material that is lighter than lead, said non-toxic material being a settable plastics material.
Claim 15
Dependent Claim
37 words
A shotgun cartridge containing a charge of a propellant together with shot formed from a tungsten-rich material that comprises tungsten and a non-toxic material that is lighter than lead, said non-toxic material being a settable plastics material.
Claim 16
Dependent Claim
17 words
A shotgun pellet or shotgun shot according to claim 1, wherein the plastics matrix is a polyethylene.
Claim 17
Dependent Claim
28 words
A shotgun cartridge, comprising: a charge of propellant and a plurality of pellets formed from a tungsten-rich material that comprises particles of tungsten in a settable plastics material.
Claim 18
Dependent Claim
28 words
A shotgun cartridge, comprising: a charge of propellant and a plurality of pellets formed from a tungsten-rich material that comprises particles of tungsten in a settable plastics material.
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) | 1993-08-20 | 1994-02-19 | 1994-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-20 | 1998-02-19 | 1998-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-20 | 2002-02-19 | 2002-08-21 | $7700.00 | Window Closed / Lapsed |