Patent US3584773A successfully refreshed from Google Patents.
US3584773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cutting of glass
Assignee: Pilkington Group Ltd
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Filing: 1969-03-25
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Granted: 1971-06-15
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Expires: 1989-03-25
Abstract
Abstract Glass is cut by employing high frequency dielectric heating of the glass through its thickness along a path which embraces a cutting line to cause a controlled fracture to run along the cutting line from a weakened point on the glass surface.
Inventors
- 👤 Francis John Grove
- 👤 Donald Curtis Wright
- 👤 Francis M Hamer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:06
CPC Classifications
C; C03; C03B; C03B33/00; C03B33/09; Y; Y10; Y10T; Y10T225/00; Y10T225/10; Y10T225/12; Y10T225/14; Y10T225/30; Y10T225/304
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
113 words
A method of cutting advancing flat glass along a predetermined cutting path parallel to its direction of advance, comprising generating a stationary high frequency electric field through a region of the glass accommodating a cutting line extending in its direction of advance so as to heat the glass through its thickness along that line to a temperature which is above that of the surrounding glass and at which the glass can support stress, to cause a controlled fracture to run along the cutting line, passing the glass through that field, and regulating the field to hold stationary relative to the field the head of the controlled fracture which runs along said cutting line.
Claim 2
Independent Claim
113 words
A method of cutting advancing flat glass along a predetermined cutting path parallel to its direction of advance, comprising generating a stationary high frequency electric field through a region of the glass accommodating a cutting line extending in its direction of advance so as to heat the glass through its thickness along that line to a temperature which is above that of the surrounding glass and at which the glass can support stress, to cause a controlled fracture to run along the cutting line, passing the glass through that field, and regulating the field to hold stationary relative to the field the head of the controlled fracture which runs along said cutting line.
Claim 3
Dependent Claim
66 words
A method according to claim 1, for trimming margins from an advancing ribbon of glass, comprising generating a stationary electric field through each margin of the ribbon extending over longitudinal paths embracing parallel cutting lines spaced in from the ribbon edges, passing the ribbon through these fields while regulating the fields to hold stationary the heads of controlled fractures along both margins of the advancing ribbon.
Claim 4
Independent Claim
99 words
A method of cutting simultaneously a stack of sheets of glass along a predetermined line, comprising forming superimposed weakened points on the surfaces of the glass sheets, and generating a high frequency electric field through the thickness of the stack of glass sheets along a path which embraces the cutting line to heat the glass through its thickness along that line to a temperature which is above that of the surrounding glass and at which the glass can support stress, to cause overlying controlled fractures to run from the weakened points along identical cutting lines through the glass sheets.
Claim 5
Independent Claim
99 words
A method of cutting simultaneously a stack of sheets of glass along a predetermined line, comprising forming superimposed weakened points on the surfaces of the glass sheets, and generating a high frequency electric field through the thickness of the stack of glass sheets along a path which embraces the cutting line to heat the glass through its thickness along that line to a temperature which is above that of the surrounding glass and at which the glass can support stress, to cause overlying controlled fractures to run from the weakened points along identical cutting lines through the glass sheets.
Claim 6
Independent Claim
117 words
A method of cutting glass comprising subjecting the glass to a high frequency electric field through its thickness along a path embracing a predetermined cutting line extending from a weakened point on the glass surface to heat the glass uniformly through its thickness along that path to a temperature at which the glass can support stress, regulating the dielectric heating of that region of thE glass in relation to the initial temperature and thickness of the glass to cause a controlled fracture to run along that line from the weakened point to a point near the other end of the path, and applying force to the glass to complete the separation of the glass along that line.
Claim 7
Independent Claim
117 words
A method of cutting glass comprising subjecting the glass to a high frequency electric field through its thickness along a path embracing a predetermined cutting line extending from a weakened point on the glass surface to heat the glass uniformly through its thickness along that path to a temperature at which the glass can support stress, regulating the dielectric heating of that region of thE glass in relation to the initial temperature and thickness of the glass to cause a controlled fracture to run along that line from the weakened point to a point near the other end of the path, and applying force to the glass to complete the separation of the glass along that line.
Claim 8
Dependent Claim
62 words
A method according to claim 4, comprising subjecting the glass to said high frequency electric field along a path embracing a predetermined cutting line defining a glass shape to be cut, regulating the electric field to cause the controlled fracture to run around said line at a predetermined rate, and separating the shaped piece of glass from the remainder of the sheet.
Claim 9
Dependent Claim
76 words
A method according to claim 4, for cutting a sheet of glass from a continuous ribbon of glass which is advancing at a controlled rate, comprising generating said field through the thickness of the moving ribbon over a predetermined cutting line extending transversely of the ribbon, advancing the field with the ribbon so that the controlled fracture runs across the ribbon as it advances, and accelerating the cut sheet away from the end of the ribbon.
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) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |