US3770405A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of fabricating laboratory glassware
Assignee: Bayer Corp
•
Filing: 1972-04-24
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Granted: 1973-11-06
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Expires: 1992-04-24
Abstract
Abstract A method of fabricating laboratory glassware to provide a relatively small, rugged article of monolithic form having one or more relatively small fluid passageways therein which may be characterized as having the appearance of wormholes. The method includes the step of preforming sacrificial tubing, sections of which may be socketed together, and socketing the tubing with tubular connectors on assembly, prior to encapsulating the assembly in glass material. The sacrificial tubing is removed after encapsulation.
Inventors
- 👤 Angelis W De
- 👤 R Luthmann
- 👤 C Meehan
- 👤 M Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:52
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/56; B01L3/561
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
164 words
A method of fabricating an article having a fluid passageway in a glass material which passageway has a junction therein, utilizing glass stock and elongated sections and sacrificial tubing of a material having a higher melting point that the glass material of the stock and an expansion coefficient compatible with said glass material, comprising the steps of: preforming said tubing sections in accordance with a predetermined layout of said passageway; positioning and supporting said preformed tubing sections with one another in accordance with said passageway layout, with one of said tubing sections having an end abutting another of said tubing sections intermediate the ends of the last mentioned section, at the location of said passageway junction; covering at least the major portion of said tubing assembly with said glass stock; molding said assembly in said glass material so as to permit access to said tubing sections, utilizing heat; and removing said tubing sections by erosion to leave said passageway formed in said glass material.
Claim 2
Independent Claim
164 words
A method of fabricating an article having a fluid passageway in a glass material which passageway has a junction therein, utilizing glass stock and elongated sections and sacrificial tubing of a material having a higher melting point that the glass material of the stock and an expansion coefficient compatible with said glass material, comprising the steps of: preforming said tubing sections in accordance with a predetermined layout of said passageway; positioning and supporting said preformed tubing sections with one another in accordance with said passageway layout, with one of said tubing sections having an end abutting another of said tubing sections intermediate the ends of the last mentioned section, at the location of said passageway junction; covering at least the major portion of said tubing assembly with said glass stock; molding said assembly in said glass material so as to permit access to said tubing sections, utilizing heat; and removing said tubing sections by erosion to leave said passageway formed in said glass material.
Claim 3
Dependent Claim
42 words
A method as defined in claim 1 wherein: at least two of said tubing sections are socketed together by sliding an extension of one section of tubing into a socket formed by another section of tubing in the assembly of the parts.
Claim 4
Dependent Claim
14 words
The method as defined in claim 1, including removing said tubing with an etchant.
Claim 5
Independent Claim
16 words
The method as defined in claimm 1, including removing said tubing by pumping an etchant therethrough.
Claim 6
Dependent Claim
54 words
A method as defined in claim 1, wherein: one of said tubing sections on preforming has an opening structured in the wall thereof intermediate the ends of the tubing section, and on assembling said tubing sections has the last-mentioned opening socketing an end of another tubing section at the location of said passageway junction.
Claim 7
Dependent Claim
39 words
The method as defined in claim 1, wherein: said tubing sections are formed of metal, and said preforming of one of said tubing sections includes bending of the last-mentioned section in accordance with said predetermined layout of said passageway.
Claim 8
Dependent Claim
22 words
The method as defined in claim 6, wherein: said preforming by bending of said one tubing section includes imparting a curl thereto.
Claim 9
Dependent Claim
63 words
A method as defined in claim 1, wherein: a nipple formed of erosion-resistant material is positioned and supported adjoining and in communication with one end of one of said tubing sections in the assembly of said tubing sections, said nipple extending without said glass material in the molding step and remaining captive in the glass material after said removal of said tubing sections.
Claim 10
Dependent Claim
43 words
A method as defined in claim 2, wherein: said two tubing sections are socketed together on assembly by an internal tubular mandrel of sacrificial material which extends between the last-mentioned tubing sections, which mandrel is removed by said erosion after said molding step.
References Cited (Backward Citations)
US2156156A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |