US3756156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bottom wad for cartridge cases, especially shot cartridge cases
Assignee: Dynamit Nobel AG
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Filing: 1970-12-02
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Granted: 1973-09-04
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Expires: 1990-12-02
Abstract
Abstract A bottom wad for cartridges, especially shot cartridges, comprising a cylindrical portion of a thermoplastic synthetic material such as synthetic resin having a front recess for the accommodation of a powder charge. A cylindrical plug is inserted in a rear recess of the cylindrical portion, and both the cylindrical plug and cylindrical portion have a common central, coaxial bore for the reception of primer.
Inventors
- 👤 E Schuster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:40
CPC Classifications
F; F42; F42B; F42B5/00; F42B5/26; F42B5/30; F42B5/307
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
88 words
Bottom wad for cartridge cases, especially shot cartridge cases, comprising a cylindrical portion defining a front recess for the accommodation of a powder charge and a rear recess, and a cylindrical plug of a relatively hard material selected from the group consisting of cardboard, fibrous material and a mineral substance inserted in the rear recess of the cylindrical portion, the rear recess being defined by an annular wall and an end wall, said cylindrical plug abutting only along the annular wall and end wall defining the rear recess.
Claim 2
Dependent Claim
88 words
Bottom wad for cartridge cases, especially shot cartridge cases, comprising a cylindrical portion defining a front recess for the accommodation of a powder charge and a rear recess, and a cylindrical plug of a relatively hard material selected from the group consisting of cardboard, fibrous material and a mineral substance inserted in the rear recess of the cylindrical portion, the rear recess being defined by an annular wall and an end wall, said cylindrical plug abutting only along the annular wall and end wall defining the rear recess.
Claim 3
Dependent Claim
24 words
Bottom wad according to claim 1, wherein the cylindrical portion and the cylindrical plug have a common central, coaxially extending perforation for receiving primer.
Claim 4
Dependent Claim
17 words
Bottom wad according to claim 2, wherein the cylindrical portion is made of a thermoplastic synthetic material.
Claim 5
Dependent Claim
13 words
Bottom wad according to claim 3, wherein the thermoplastic synthetic material is polyethylene.
Claim 6
Dependent Claim
32 words
Bottom wad according to claim 1, wherein the rear recess of the cylindrical portion is provided with annular grooves, and the cylindrical plug is insertable into these grooves along the periphery therof.
Claim 7
Dependent Claim
24 words
Bottom wad according to claim 5, wherein the cylindrical portion and the cylindrical plug have a common central, coaxially extending perforation for receiving primer.
Claim 8
Dependent Claim
17 words
Bottom wad according to claim 6, wherein the cylindrical portion is made of a thermoplastic synthetic material.
Claim 9
Dependent Claim
21 words
Bottom wad according to claim 1, wherein the cylindrical portion terminates in a thin annular lip at the front end thereof.
Claim 10
Dependent Claim
24 words
Bottom wad according to claim 8, wherein the cylindrical portion and the cylindrical plug have a common central, coaxially extending perforation for receiving primer.
Claim 11
Dependent Claim
17 words
Bottom wad according to claim 9, wherein the cylindrical portion is made of a thermoplastic synthetic material.
Claim 12
Dependent Claim
32 words
Bottom wad according to claim 10, wherein the rear recess of the cylindrical portion is provided with annular grooves, and the cylindrical plug is insertable into these grooves along the periphery thereof.
Claim 13
Dependent Claim
41 words
Bottom wad according to claim 1, wherein the wall thickness of the cylindrical portion narrows in the zone of the front recess toward the front end thereof so that an annular support means is formed for supporting an intermediate cartridge substance.
Claim 14
Dependent Claim
24 words
Bottom wad according to claim 12, wherein the cylindrical portion and the cylindrical plug have a common central, coaxially extending perforation for receiving primer.
Claim 15
Dependent Claim
17 words
Bottom wad according to claim 13, wherein the cylindrical portion is made of a thermoplastic synthetic material.
Claim 16
Dependent Claim
32 words
Bottom wad according to claim 13, wherein the rear recess of the cylindrical portion is provided with annular grooves, and the cylindrical plug is insertable into these grooves along the periphery thereof.
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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |