US3682613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for press bending glass sheets
Assignee: PPG Industries Inc
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Filing: 1970-10-15
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Granted: 1972-08-08
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Expires: 1990-10-15
Abstract
Abstract Apparatus for bending glass sheets into nonuniform curvatures including a region of shallow curvature and at least one sharply bent region comprising a mold having an apertured shaping wall comprising a portion of shallow curvature, a closed chamber behind said portion of relatively shallow curvature and one or more sharply bent portions adjustable in shape to conform to one or more sharply bent regions to be impressed into the glass sheet.
Inventors
- 👤 Randall Scott Johnson
- 👤 Vaughn Roger Imler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:45
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/02; C03B23/023; C03B23/035; C03B23/0352; C03B23/0357; C03B23/03; C03B23/0305; C03B23/0307
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |