US3278288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for bending and tempering glass sheets
Assignee: Libbey Owens Ford Glass Co
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Filing: 1963-04-15
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Granted: 1966-10-11
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Expires: 1983-04-15
Abstract
No abstract record available.
Inventors
- 👤 Jr Herbert A Leflet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:11
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/02; C03B23/023; C03B23/025; C03B23/0258; C03B25/00; C03B25/04; C03B25/06; C03B25/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
A METHOD OF BENDING AND ANNEALING GLASS SHEETS, COMPRISING SUPPORTING A PATTERN-CUT FLAT GLASS SHEET TO BE BENT ON A SKELETON-TYPE BENDING MOLD HAVING A SHAPING RAIL CONFORMING IN OUTLINE TO THE SHEET BUT RELATIVE SMALLER IN SIZE TO SUPPORT THE SHEET INWARDLY OF ITS MARGINAL EDGES, HEATING THE SHEET WHILE THUS SUPPORTED TO AN ELEVATED TEMPETURE SUFFICIENT TO CAUSE THE SHEET TO SOFTEN AND SAGE INTO CONTACT WITH A CURVED SHAPING SURFACE FORMED ON SAID DHSPING RAIL, SUBJECTING SAID SHEET TO A COOLING ATMOSPHERE TO REDUCE THE TEMPERATURE THEREOF IN A CONTROLLED MANNER, AND SIMULTANEOUSLY SUPPLYING SUPPLEMENTAL HEAT TO SAID SHAPING RAIL TO MAINTAIN THE AREAS OF THE GLASS SHEET IN CONTACT WITH AND CLOSELY ADJACENT TO THE SHAPING SURFACE AT AN ELEVATED TEMPERATURE UNTIL THE REMAINING AREAS OF THE SHEET HAVE COLLED TO A TEMPERATURE BELOW THE ANNEALING RANGE OF THE GLASS AND THEN DISCONTINUING SAID SUPPLEMENTAL HEAT AND PERMITTING THE TOTAL SHEET TO COOL TO AMBIENT TEMPERATURE.
Claim 2
Independent Claim
160 words
A METHOD OF BENDING AND ANNEALING GLASS SHEETS, COMPRISING SUPPORTING A PATTERN-CUT FLAT GLASS SHEET TO BE BENT ON A SKELETON-TYPE BENDING MOLD HAVING A SHAPING RAIL CONFORMING IN OUTLINE TO THE SHEET BUT RELATIVE SMALLER IN SIZE TO SUPPORT THE SHEET INWARDLY OF ITS MARGINAL EDGES, HEATING THE SHEET WHILE THUS SUPPORTED TO AN ELEVATED TEMPETURE SUFFICIENT TO CAUSE THE SHEET TO SOFTEN AND SAGE INTO CONTACT WITH A CURVED SHAPING SURFACE FORMED ON SAID DHSPING RAIL, SUBJECTING SAID SHEET TO A COOLING ATMOSPHERE TO REDUCE THE TEMPERATURE THEREOF IN A CONTROLLED MANNER, AND SIMULTANEOUSLY SUPPLYING SUPPLEMENTAL HEAT TO SAID SHAPING RAIL TO MAINTAIN THE AREAS OF THE GLASS SHEET IN CONTACT WITH AND CLOSELY ADJACENT TO THE SHAPING SURFACE AT AN ELEVATED TEMPERATURE UNTIL THE REMAINING AREAS OF THE SHEET HAVE COLLED TO A TEMPERATURE BELOW THE ANNEALING RANGE OF THE GLASS AND THEN DISCONTINUING SAID SUPPLEMENTAL HEAT AND PERMITTING THE TOTAL SHEET TO COOL TO AMBIENT TEMPERATURE.
References Cited (Backward Citations)
US2869287A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-10 | 1970-04-11 | 1970-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-10 | 1974-04-11 | 1974-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-10 | 1978-04-11 | 1978-10-11 | $7700.00 | Window Closed / Lapsed |