Patent US4397672A successfully refreshed from Google Patents.
US4397672A
Expired / Lapsed
US
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Glass sheet tempering utilizing high density air quenching
Assignee: GLT CORP A CORP OF
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Filing: 1982-02-05
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Granted: 1983-08-09
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Expires: 2002-02-05
Abstract
Abstract A method and quench unit (10,10a,10b) disclosed provide tempering of a heated glass sheet by impinging pressurized air against its opposite surfaces while within a chamber (18) at super-atmospheric pressure. An enclosure (16) of the quench unit defines the chamber (18) and is preferably pressurized by the spent quenching air which is delivered through opposed blastheads (12). The spent quenching air is removed from the chamber (18) to maintain the air pressure below a predetermined level. An air supply system (24) disclosed cools and pressurizes the spent quenching air received from the chamber (18) and then feeds this air back to the blastheads (12) in a recirculating fashion for impingement with the glass sheet in the chamber.
Inventors
- 👤 John S. Nitschke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:56
CPC Classifications
C; C03; C03B; C03B27/00; C03B27/04; C03B27/052; C03B27/0417; C03B27/044; C03B27/0442
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
40 words
A method for tempering a heated glass sheet comprising: impinging quenching air against the opposite surfaces of the heated glass sheet while within an enclosed chamber maintained at superatmospheric pressure above about 10 pounds per square inch over atmospheric pressure.
Claim 2
Independent Claim
40 words
A method for tempering a heated glass sheet comprising: impinging quenching air against the opposite surfaces of the heated glass sheet while within an enclosed chamber maintained at superatmospheric pressure above about 10 pounds per square inch over atmospheric pressure.
Claim 3
Independent Claim
45 words
A method for tempering a heated glass sheet comprising: impinging quenching air against the opposite surfaces of the heated glass sheet while within an enclosed chamber maintained at superatmospheric pressure; and cooling and recirculating the pressurized quenching air for repeated impingement with the glass sheet.
Claim 4
Independent Claim
45 words
A method for tempering a heated glass sheet comprising: impinging quenching air against the opposite surfaces of the heated glass sheet while within an enclosed chamber maintained at superatmospheric pressure; and cooling and recirculating the pressurized quenching air for repeated impingement with the glass sheet.
Claim 5
Independent Claim
60 words
A method for tempering a heated glass sheet comprising: impinging quenching air against the opposite surfaces of the heated glass sheet while within an enclosed chamber maintained by the spent quenching air at superatmospheric pressure above about 10 pounds per square inch over atmospheric pressure; and cooling and recirculating the pressurized quenching air for repeated impingement with the glass sheet.
Claim 6
Independent Claim
60 words
A method for tempering a heated glass sheet comprising: impinging quenching air against the opposite surfaces of the heated glass sheet while within an enclosed chamber maintained by the spent quenching air at superatmospheric pressure above about 10 pounds per square inch over atmospheric pressure; and cooling and recirculating the pressurized quenching air for repeated impingement with the glass sheet.
Claim 7
Dependent Claim
61 words
In a glass sheet quench unit including opposed blastheads for impinging quenching air against a heated glass sheet positioned therebetween to temper the glass sheet, the improvement comprising: a blasthead enclosure defining an enclosed chamber which receives the blastheads and which is pressurized with superatmospheric pressure during the tempering; and means for sensing and controlling the superatmospheric pressure within the chamber.
Claim 8
Dependent Claim
61 words
In a glass sheet quench unit including opposed blastheads for impinging quenching air against a heated glass sheet positioned therebetween to temper the glass sheet, the improvement comprising: a blasthead enclosure defining an enclosed chamber which receives the blastheads and which is pressurized with superatmospheric pressure during the tempering; and means for sensing and controlling the superatmospheric pressure within the chamber.
Claim 9
Dependent Claim
66 words
In a glass sheet quench unit including opposed blastheads for impinging quenching air against a heated glass sheet positioned therebetween to temper the glass sheet, the improvement comprising: a blasthead enclosure defining an enclosed chamber which receives the blastheads and which is pressurized with superatmospheric pressure during the tempering; and means for cooling and recirculating the pressurized quenching air for repeated impingement with the glass sheet.
Claim 10
Dependent Claim
66 words
In a glass sheet quench unit including opposed blastheads for impinging quenching air against a heated glass sheet positioned therebetween to temper the glass sheet, the improvement comprising: a blasthead enclosure defining an enclosed chamber which receives the blastheads and which is pressurized with superatmospheric pressure during the tempering; and means for cooling and recirculating the pressurized quenching air for repeated impingement with the glass sheet.
Claim 11
Dependent Claim
77 words
In a glass sheet quench unit including opposed blastheads for impinging quenching air against a heated glass sheet positioned therebetween to temper the glass sheet, the improvement comprising: a blasthead enclosure defining an enclosed chamber which receives the blastheads and which is pressurized with superatmospheric pressure during the tempering; means for sensing and controlling the superatmospheric pressure within the chamber; and means for cooling and recirculating the pressurized quenching air for repeated impingement with the glass sheet.
Claim 12
Dependent Claim
77 words
In a glass sheet quench unit including opposed blastheads for impinging quenching air against a heated glass sheet positioned therebetween to temper the glass sheet, the improvement comprising: a blasthead enclosure defining an enclosed chamber which receives the blastheads and which is pressurized with superatmospheric pressure during the tempering; means for sensing and controlling the superatmospheric pressure within the chamber; and means for cooling and recirculating the pressurized quenching air for repeated impingement with the glass sheet.
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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) | 1986-08-08 | 1987-02-07 | 1987-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-08 | 1991-02-07 | 1991-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-08 | 1995-02-07 | 1995-08-09 | $7700.00 | Window Closed / Lapsed |