Patent US3918216A successfully refreshed from Google Patents.
US3918216A
Expired / Lapsed
US
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Tubing severing method
Assignee: Corning Glass Works
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Filing: 1975-03-17
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Granted: 1975-11-11
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Expires: 1995-03-17
Abstract
Abstract A method of cutting or severing tubing of a brittle material such as, for example, tubing of a glass, glass-ceramic or ceramic crystalline material which is subject to chipping, cracking or checking when severed or cut by heretofore known methods.
Inventors
- 👤 Howard S Best
- 👤 Bruce A Milliman
- 👤 Edward J Zak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:28
CPC Classifications
B; B24; B24B; B24B27/00; B24B27/06; B24B27/0675
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
100 words
The method of severing tubing of a relatively brittle material, such method comprising the steps of; I. rotating a length of said tubing about its longitudinal axis, II. grinding the outer surface layer from said length of tubing in a selected annular region thereof to provide a smooth shallow annular recess therein having beveled ends, III. terminating rotation of said length of tubing and clamping it in a stationary position, and IV. cutting through said length of clamped tubing in the center of said annular recess to provide two lengths of tubing having beveled cut ends similar to each other.
Claim 2
Independent Claim
100 words
The method of severing tubing of a relatively brittle material, such method comprising the steps of; I. rotating a length of said tubing about its longitudinal axis, II. grinding the outer surface layer from said length of tubing in a selected annular region thereof to provide a smooth shallow annular recess therein having beveled ends, III. terminating rotation of said length of tubing and clamping it in a stationary position, and IV. cutting through said length of clamped tubing in the center of said annular recess to provide two lengths of tubing having beveled cut ends similar to each other.
Claim 3
Dependent Claim
20 words
A method in accordance with claim 1 and in which said material of said tubing is a brittle crystalline material.
Claim 4
Independent Claim
116 words
The method of severing tubing of a brittle material, such method comprising the steps of; I. rotating a length of said tubing about its longitudinal axis, II. contacting an annular region of said rotating length of tubing with the peripheral surface of a rotating grinding wheel, such surface including beveled edges to provide in said annular region a smooth shallow annular recess having beveled ends, III. terminating rotation of said length of tubing and clamping it against movement, and IV. passing the cutting edge of a rotating cutting disk through the center of said annular region of said length of clamped tubing to provide two cut lengths of tubing having similarly ground and beveled cut ends.
Claim 5
Independent Claim
116 words
The method of severing tubing of a brittle material, such method comprising the steps of; I. rotating a length of said tubing about its longitudinal axis, II. contacting an annular region of said rotating length of tubing with the peripheral surface of a rotating grinding wheel, such surface including beveled edges to provide in said annular region a smooth shallow annular recess having beveled ends, III. terminating rotation of said length of tubing and clamping it against movement, and IV. passing the cutting edge of a rotating cutting disk through the center of said annular region of said length of clamped tubing to provide two cut lengths of tubing having similarly ground and beveled cut ends.
Claim 6
Dependent Claim
20 words
A method in accordance with claim 3 and in which said material of said tubing is a brittle crystalline material.
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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |