Patent US3623838A successfully refreshed from Google Patents.
US3623838A
Expired / Lapsed
US
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Process for the production of lead oxides
Assignee: Lindgens and Sohne
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Filing: 1968-12-19
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Granted: 1971-11-30
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Expires: 1988-12-19
Abstract
Abstract THE RED MODIFICATION OF LEAD OXIDE, WHICH IS CONVERTIBLE TO PB3O4 BY OXIDATION AT BELOW ABOUT 500*C. OR TO THE YELLOW MODIFICATION OF PBO BY OXIDATION AT ABOVE ABOUT 550*C., IS PRODUCED. THE RAW OXIDE PRODUCED IS IN A HIGHLY REACTIVE FORM HAVING LOW ABRASION AND SATISFACTORY FREE FLOWING PROPERTIES AND IS FREE OF ADDED BONDING AGENT. PRODUCTION IS EFFECTED BY ADDING ABOUT 4 TO 10% WATER TO RAW LEAD OXIDE PARTICLES CONTAINING LESS THAN ABOUT 30% METALLIC LEAD, THE RAW LEAD OXIDE NOT CONTAINING A SUBSTANTIAL AMOUNT OF PARTICLES OF MORE THAN 20 MICRONS DIAMETER. THE MIXTURE OF WATER AND RAW LEAD OXIDE IS GRANULATED, AND THE GRANULES ARE DRIED.
Inventors
- 👤 Wilhelm Kunz
- 👤 Walter Breckheimer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:04
CPC Classifications
C; C01; C01G; C01G21/00; C01G21/02; C01G21/10; C01G21/06; C09; C09C; C09C1/00; C09C1/14; C01P; C01P2004/00; C01P2004/50; C01P2006/00; C01P2006/60
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) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |