Patent US4306498A successfully refreshed from Google Patents.
US4306498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ink-retaining sealing article
Assignee: Bando Chemical Industries Ltd
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Filing: 1980-05-21
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Granted: 1981-12-22
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Expires: 2000-05-21
Abstract
Abstract A stamping article which is capable of repeatedly stamping with liquid ink, said article consisting of: (1) a stamping member having relief characters with a stamping surface and having a porosity of 20 to 50%, which is of porous structure and is produced by sintering a fine powder which is obtained by pulverizing a porous thermoplastic resin, (2) a base member capable of storing liquid ink and having a porosity of 60 to 80%, said base member comprising at least one material selected from the group porous, plastic foamed materials and fibrous, reticulate fabrics, which materials are co-fusible or bondable with said thermoplastic resin powder, said base member having a porosity 10-40% higher than said stamping member so as to insure a smooth flow of ink therebetween, said stamping member being fused with said base member.
Inventors
- 👤 Kazuyuki Fujimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:44
CPC Classifications
B; B41; B41N; B41N1/00; B41N1/12; B41K; B41K1/00; B41K1/36; B41K1/38; B41K1/50; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/24496; Y10T428/24504; Y10T428/249921; Y10T428/249953; Y10T428/249978; Y10T428/249979; Y10T428/249981; Y10T428/249994; Y10T428/249995; Y10T428/249996
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
136 words
A stamping article which is capable of repeatedly stamping with liquid ink, said article consisting of: (1) a stamping member having relief characters with a stamping surface and having a porosity of 20 to 50%, which is of porous structure and is produced by sintering a fine powder which is obtained by pulverizing a porous thermoplastic resin, (2) a base member capable of storing liquid ink and having a porosity of 60 to 80%, said base member comprising at least one material selected from the group porous, plastic foamed materials and fibrous, reticulate fabrics, which materials are cofusible or bondable with said thermoplastic resin powder, said base member having a porosity 10-40% higher than said stamping member so as to insure a smooth flow of ink therebetween, said stamping member being fused with said base member.
Claim 2
Dependent Claim
136 words
A stamping article which is capable of repeatedly stamping with liquid ink, said article consisting of: (1) a stamping member having relief characters with a stamping surface and having a porosity of 20 to 50%, which is of porous structure and is produced by sintering a fine powder which is obtained by pulverizing a porous thermoplastic resin, (2) a base member capable of storing liquid ink and having a porosity of 60 to 80%, said base member comprising at least one material selected from the group porous, plastic foamed materials and fibrous, reticulate fabrics, which materials are cofusible or bondable with said thermoplastic resin powder, said base member having a porosity 10-40% higher than said stamping member so as to insure a smooth flow of ink therebetween, said stamping member being fused with said base member.
Claim 3
Dependent Claim
36 words
The stamping article as defined in claim 1, wherein the thermoplastic resin powder is a powder produced by pulverizing a plastic foam selected from the group of gelated materials and semi-gelated materials comprising plasticized polyvinyl chloride.
Claim 4
Dependent Claim
16 words
The stamping article as defined in claim 1, which contains a supply of liquid ink therein.
Claim 5
Dependent Claim
21 words
The stamping article according to claim 1 wherein said thermoplastic powder has a bulk specific gravity of 0.25-0.30 g/cm 3 .
Claim 6
Dependent Claim
35 words
The stamping article according to claim 1 wherein the stamping member has a porosity of from about 5 to 50 microns and the base member has a porosity of from about 10 to 100 microns.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-21 | 1985-06-22 | 1985-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-21 | 1989-06-22 | 1989-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-21 | 1993-06-22 | 1993-12-22 | $7700.00 | Window Closed / Lapsed |