Patent US5445638B1 successfully refreshed from Google Patents.
US3423186A
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US
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Scraped removal of metal oxide deposit by a ceramic edge
Assignee: PPG Industries Inc
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Filing: 1964-07-02
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Granted: 1969-01-21
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Expires: 1984-07-02
Abstract
No abstract record available.
Inventors
- 👤 Donald E Darr
- 👤 Roger S Leiser
- 👤 Clifford E Loehr
- 👤 Kenneth W Richardson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:21
CPC Classifications
C; C01; C01B; C01B35/00; C01B35/06; B; B01; B01J; B01J19/00; B01J19/0006; B01J19/002; B08; B08B; B08B9/00; B08B9/08; B08B9/087; C01B13/00; C01B13/14; C01B13/20; C01B13/22; C01B25/00; C01B25/12; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/181; C01B33/183; C01B35/08; C01B35/10; C01G; C01G23/00; C01G23/04; C01G23/047; C01G23/07; C01P; C01P2002/00; C01P2002/50; C01P2002/52; C01P2002/54; C01P2006/00; C01P2006/60; C01P2006/80
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2805921A
Cited
US3250687A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-21 | 1972-07-22 | 1973-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-21 | 1976-07-22 | 1977-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-21 | 1980-07-22 | 1981-01-21 | $7700.00 | Window Closed / Lapsed |