US4251254A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tools for the handling and shaping of glass
Assignee: US Philips Corp
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Filing: 1979-05-10
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Granted: 1981-02-17
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Expires: 1999-05-10
Abstract
Abstract Tools for the handling and shaping of glass, such as dies, moulds, shears. Sticking of the glass to the tool is prevented by the presence, at the tool surface, of a layer which has a low intrinsic strength with respect to the glass. This layer may be present as such or may be produced after oxidation. A number of possible materials are: boron carbide, Ni-Cr-B-alloys, tantalum boride.
Inventors
- 👤 Johannes T. Klomp
- 👤 Peter J. Vrugt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:46
CPC Classifications
C; C03; C03B; C03B40/00; C22; C22C; C22C29/00; C22C29/14; C25; C25D; C25D11/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
56 words
A glass working tool for the handling and shaping of glass at low viscosities, said tool containing at least in its surface layer a boron-containing material selected from the group consisting of titanium boride and boron carbide, said boron-containing material capable, upon oxidation, of forming a layer of boron trioxide at the surface of said tool.
Claim 2
Dependent Claim
56 words
A glass working tool for the handling and shaping of glass at low viscosities, said tool containing at least in its surface layer a boron-containing material selected from the group consisting of titanium boride and boron carbide, said boron-containing material capable, upon oxidation, of forming a layer of boron trioxide at the surface of said tool.
Claim 3
Dependent Claim
40 words
A tool as claimed in claim 1 having a surface coated with a thin layer of inert material through which the boron-containing material can preferentially diffuse said inert material being selected from the group consistng of palladium, tungsten and molybdenum.
Claim 4
Dependent Claim
29 words
A tool of claim 1 having a surface layer of a wear-resistant, porous material, the pores of which material contain the boron-containing material or the boron trioxide formed therefrom.
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) | 1984-02-17 | 1984-08-18 | 1985-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-17 | 1988-08-18 | 1989-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-17 | 1992-08-18 | 1993-02-17 | $7700.00 | Window Closed / Lapsed |