US3608766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tempered stemware and process of making it
Assignee: COMPAZNIE DE SAINT GOBAIN
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Filing: 1968-12-19
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Granted: 1971-09-28
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Expires: 1988-12-19
Abstract
Abstract Footed glassware is, for the first time, satisfactorily tempered by annealing hollow glassware, such as goblets and blowing them with air jets. The annealing raises the surface temperature of the stemware to about 660* to 680* C. in the cup and to about 490* to 500* C. in the midlength of the stem. The new glass is of superior resistance to mechanical and thermal shocks.
Inventors
- 👤 Rene D Orefice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:01
CPC Classifications
C; C03; C03B; C03B27/00; C03B27/04; C03B27/06; A; A47; A47G; A47G19/00; A47G19/22; A47G19/2205; C03B27/065; Y; Y10; Y10S; Y10S65/00; Y10S65/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
60 words
A method of tempering glass stemware comprising cups, stems, and feet which comprises heating such ware to temperatures which decrease from above 600* C. at the rim of the foot to below 500* C. at midstem and increase thence to a maximum above about 650* C. below the rim of the cup, and chilling the stemware at a tempering rate.
Claim 2
Independent Claim
60 words
A method of tempering glass stemware comprising cups, stems, and feet which comprises heating such ware to temperatures which decrease from above 600* C. at the rim of the foot to below 500* C. at midstem and increase thence to a maximum above about 650* C. below the rim of the cup, and chilling the stemware at a tempering rate.
Claim 3
Independent Claim
44 words
A method of tempering glass stemware which comprises annealing the glass under conditions which produce in the cup surface temperatures of 660* to 680* C., and 490* to 500* C. in the midportion of the stem, and chilling the stemware at a tempering rate.
Claim 4
Independent Claim
44 words
A method of tempering glass stemware which comprises annealing the glass under conditions which produce in the cup surface temperatures of 660* to 680* C., and 490* to 500* C. in the midportion of the stem, and chilling the stemware at a tempering rate.
Claim 5
Dependent Claim
64 words
Tempered glass goblets comprising cups, stems, and feet of differing thickness varying from thinnest at the rim of the cup to thickest at the stem, the stem being on the order of several times the thickness of the upper part of the cup, having surface compression at least equal to 410 kg./cm.2 and fragmenting into pieces less than 3 cm. in their largest dimension.
Claim 6
Dependent Claim
64 words
Tempered glass goblets comprising cups, stems, and feet of differing thickness varying from thinnest at the rim of the cup to thickest at the stem, the stem being on the order of several times the thickness of the upper part of the cup, having surface compression at least equal to 410 kg./cm.2 and fragmenting into pieces less than 3 cm. in their largest dimension.
Claim 7
Dependent Claim
26 words
Tempered glass goblets according to claim 3 in which the stems are at least about four times the thickness of the upper part of the cups.
Claim 8
Dependent Claim
73 words
A method according to claim 2 which includes the steps of annealing the stemware at a temperature and for a time equivalent to about 3 minutes 15 seconds at about 720* C., blowing the outside of the stemware with air at room temperature and a relative pressure of 50 mm. of Hg., and blowing the inside of the cup with air at room temperature and a pressure of about 120 mm. of Hg.
References Cited (Backward Citations)
US2254227A
Cited
US2344630A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |