Patent US3247626A successfully refreshed from Google Patents.
US3247626A
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US
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Glass planing process
Assignee: PPG Industries Inc
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Filing: 1963-04-30
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Granted: 1966-04-26
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Expires: 1983-04-30
Abstract
No abstract record available.
Inventors
- 👤 Gerald E Kunkle
- 👤 William C Harrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:15
CPC Classifications
B; B24; B24B; B24B7/00; B24B7/20; B24B7/22; B24B7/24; B24B7/241; B24B55/00; B24B55/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
THE METHOD OF PLANING FLAT GLASS HAVING VERY WIDE SURFACE DEFECTS ON THE ORDER OF ONE MICRON AND LESS IN DEPTH COMPRISING RUBBING THE GLASS SURFACE WITH A THERMOPLASTIC TOOL HAVING A SHORE D DUROMETER HARDNESS BETWEEN 60 AND 90, WHILE CONTINUOUSLY SUPPLYING A WATER SLURRY OF FINELY DIVIDED RARE EARTH ABRASIVES UNDER THREE MICRONS DIAMETER TO THE GLASS-TOOL INTERFACE.
Claim 2
Independent Claim
60 words
THE METHOD OF PLANING FLAT GLASS HAVING VERY WIDE SURFACE DEFECTS ON THE ORDER OF ONE MICRON AND LESS IN DEPTH COMPRISING RUBBING THE GLASS SURFACE WITH A THERMOPLASTIC TOOL HAVING A SHORE D DUROMETER HARDNESS BETWEEN 60 AND 90, WHILE CONTINUOUSLY SUPPLYING A WATER SLURRY OF FINELY DIVIDED RARE EARTH ABRASIVES UNDER THREE MICRONS DIAMETER TO THE GLASS-TOOL INTERFACE.
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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) | 1969-04-25 | 1969-10-25 | 1970-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-25 | 1973-10-25 | 1974-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-25 | 1977-10-25 | 1978-04-26 | $7700.00 | Window Closed / Lapsed |