Patent US2431674A successfully refreshed from Google Patents.
Patent US3348935A successfully refreshed from Google Patents.
US3348935A
Expired / Lapsed
US
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Method for bending glass sheet to a complex curvature
Assignee: Libbey Owens Ford Glass Co
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Filing: 1955-08-11
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Granted: 1967-10-24
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Expires: 1975-08-11
Abstract
No abstract record available.
Inventors
- 👤 Frank J Carson
- 👤 Jr Herbert A Leflet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:51
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/02; C03B23/023; C03B23/025; C03B23/027
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
124 words
A METHOD OF BENDING A GLASS SHEET TO A COMPLEX CURVATURE INCLUDING BENDS ABOUT BOTH THE TRANSVERSE AND LONGITUDINAL AXES OF SAID SHEET, COMPRISING HEATING THE SHEET TO SAGGING TEMPERATURE AND BENDING THE MARGINAL EDGE PORTION OF SAID SHEET INTO CONFORMITY WITH THE SHAPING SURFACE OF A CONCAVELY CURVED MOLD, AND AFTER THE SHEET CONTACT THE MOLD SHAPING SURFACE RETARDING THE HEATING OF A SHEET PORTION SPACED INWARDLY OF ONE OF THE LONITUDINAL EDGES OF THE SHEET AND CONCETRATING RADIANT HEAT ON A LONGTIDINALLY EXTENDING AREA OF THE SHEET BETWEEN THE SHEET AREA HAVING THE HEATING THEREOF RETARDED AND THE ONE LONGITUDINAL SHEET EDGE WHILE CONTINUING TO HEAT AND SHEET TO CAUSE THE SHEET TO SAG DOWNWARDLY INWARDLY OF THE MAGGINAL EDGEE PORTIONS THEREOF.
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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) | 1970-10-23 | 1971-04-24 | 1971-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-23 | 1975-04-24 | 1975-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-23 | 1979-04-24 | 1979-10-24 | $7700.00 | Window Closed / Lapsed |