US3983293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mold for forming glass articles
Assignee: Toyo Kohan Co Ltd
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Filing: 1975-08-06
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Granted: 1976-09-28
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Expires: 1995-08-06
Abstract
Abstract A metal mold for forming glass articles having a porous lining layer having an excellent heat-insulating property and the abrasion resistance at high temperature, porous lining layer being so designed that a suitable amount of water can be contained therein. As the lining material, there are used materials having an excellent heat-insulating property, such as hollow glass powder and diatomaceous earth, and materials having excellent abrasion resistance, such as metal powder and ceramic powder. Mainly a heat-resistant polymeric adhesive is used for lining such material on a metal mold.
Inventors
- 👤 Keishi Ohuchi
- 👤 Kenzo Matsui
- 👤 Keizo Tamai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:20
CPC Classifications
C; C03; C03B; C03B9/00; C03B9/30; C03B9/38; C03B9/3875; C03B9/34; C03B9/3808; C03B9/48; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12042; Y10T428/25; Y10T428/252; Y10T428/256; Y10T428/26
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
75 words
A mold for use in molding glass articles which comprises a porous layer lining on the inner surface of a metal mold, said porous layer being composed of a glass or ceramic material having a melting point higher than 400° C. and said porous layer having a heat conductivity not higher than 0.005 Joul/cm.sec.° K as measured at room temperature, a thickness of 40 to 3,000 microns and a porosity of 30 to 70 percent.
Claim 2
Dependent Claim
75 words
A mold for use in molding glass articles which comprises a porous layer lining on the inner surface of a metal mold, said porous layer being composed of a glass or ceramic material having a melting point higher than 400° C. and said porous layer having a heat conductivity not higher than 0.005 Joul/cm.sec.° K as measured at room temperature, a thickness of 40 to 3,000 microns and a porosity of 30 to 70 percent.
Claim 3
Dependent Claim
26 words
A mold as set forth in claim 1 wherein the porous layer is composed of hollow glass powder having a particle size not exceeding 200 microns.
Claim 4
Dependent Claim
18 words
A mold as set forth in claim 1 wherein the porous layer is composed of a porous enamel.
Claim 5
Dependent Claim
97 words
A mold for use in molding glass articles which comprises a heat-insulating layer lining on the inner surface of a metal mold, said heat-insulating layer having a heat conductivity not higher than 0.005 Joul/cm.sec.° K as measured at room temperature and a thickness of 40 to 3,000 μ, and a porous layer laminated on said heat-insulating layer, said porous layer being composed of a metallic, glass or ceramic material having a melting point higher than 400° C. and said porous layer having a thickness of 40 to 1,000 microns and a porosity of 30 to 70 percent.
Claim 6
Dependent Claim
97 words
A mold for use in molding glass articles which comprises a heat-insulating layer lining on the inner surface of a metal mold, said heat-insulating layer having a heat conductivity not higher than 0.005 Joul/cm.sec.° K as measured at room temperature and a thickness of 40 to 3,000 μ, and a porous layer laminated on said heat-insulating layer, said porous layer being composed of a metallic, glass or ceramic material having a melting point higher than 400° C. and said porous layer having a thickness of 40 to 1,000 microns and a porosity of 30 to 70 percent.
Claim 7
Dependent Claim
25 words
A mold as set forth in claim 4 wherein the laminated porous layer is composed of powder having a particle size not exceeding 200 microns.
Claim 8
Dependent Claim
26 words
A mold as set forth in claim 4 wherein the laminated porous layer is composed of a porous sintered metal or a porous sintered ceramic material.
References Cited (Backward Citations)
US2169384A
Cited
US3325303A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |