Patent US3577924A successfully refreshed from Google Patents.
US3577924A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shotshells
Assignee: PPG Architectural Coatings Canada Inc
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Filing: 1969-02-14
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Granted: 1971-05-11
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Expires: 1989-02-14
Abstract
Abstract The present invention provides a novel shotshell basewad construction by which the useful life of reloadable shotshells may be increased. The basewad comprises two interlocking components of molded thermoplastic material which are pressed into the bottom end of a shotshell tube. The basewad construction provides increased durability and improved gas sealing properties over earlier known types.
Inventors
- 👤 Donald Urquhart Findlay
- 👤 Francis Hamnet Garla Mccaffrey
- 👤 George David Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:20
CPC Classifications
F; F42; F42B; F42B5/00; F42B5/26; F42B5/30; F42B5/307; F42B5/313
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
233 words
A shotshell comprising in combination a cup-shaped metallic head having a central aperture, a primer cap mounted in said aperture, a tubular casing held within said metallic head by the sidewall thereof, a propellant charge within said casing, a basewad positioned between said propellant charge and said metallic head, an over-powder filler wad or wads adjacent said propellant charge and a shot load within said container and adjacent said filler wad, the said basewad consisting of two separate but interlockingly engaged resilient thermoplastic body components in superimposed upper and lower relationship, the upper of said body components comprising a cylindrical thermoplastic body having a frustoconical aperture centrally thereof, an upwardly extending tapered wall at the periphery of said cylindrical body and integral therewith and a peripheral recess at the outer, lower edge of said cylindrical body, said tapered wall being adapted to provide a gastight seal between said upper body component and said tubular casing; and the lower of said body components comprising a frustoconical thermoplastic body having an aperture centrally thereof adapted to receive said primer cap in firm, gastight relationship, an outwardly radially extending flange at the base of said frustoconical body and integral therewith and an upwardly extending wall at the periphery of said outwardly extending flange and integral therewith, the said upwardly extending wall being of a height not substantially greater than the height of the said frustoconical body.
Claim 2
Dependent Claim
233 words
A shotshell comprising in combination a cup-shaped metallic head having a central aperture, a primer cap mounted in said aperture, a tubular casing held within said metallic head by the sidewall thereof, a propellant charge within said casing, a basewad positioned between said propellant charge and said metallic head, an over-powder filler wad or wads adjacent said propellant charge and a shot load within said container and adjacent said filler wad, the said basewad consisting of two separate but interlockingly engaged resilient thermoplastic body components in superimposed upper and lower relationship, the upper of said body components comprising a cylindrical thermoplastic body having a frustoconical aperture centrally thereof, an upwardly extending tapered wall at the periphery of said cylindrical body and integral therewith and a peripheral recess at the outer, lower edge of said cylindrical body, said tapered wall being adapted to provide a gastight seal between said upper body component and said tubular casing; and the lower of said body components comprising a frustoconical thermoplastic body having an aperture centrally thereof adapted to receive said primer cap in firm, gastight relationship, an outwardly radially extending flange at the base of said frustoconical body and integral therewith and an upwardly extending wall at the periphery of said outwardly extending flange and integral therewith, the said upwardly extending wall being of a height not substantially greater than the height of the said frustoconical body.
Claim 3
Dependent Claim
42 words
A shotshell as claimed in claim 1 wherein the Bottom component of the two-piece basewad is provided with a peripheral recess at the outer lower edge thereof at the point of intersection of its outwardly extending flange and its upwardly extending wall.
Claim 4
Dependent Claim
34 words
A shotshell as claimed in claim 1 wherein the thermoplastic material comprising the top component of the two-piece basewad is of greater flexibility than the thermoplastic material comprising the bottom component of said basewad.
Claim 5
Dependent Claim
54 words
A shotshell as claimed in claim 3 wherein the top component of the two-piece basewad is made of polyethylene of a density of from about 0.91 gm./cm.3 to about 0.93 gm./cm.3 and the bottom component of said basewad is made of polyethylene of a density of from about 0.95 gm./cm.3 to about 0.97 gm./cm.3.
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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |