US2447532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of pigment comprising calcium carbonate
Assignee: Raffold Process Corp
•
Filing: 1946-12-27
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Granted: 1948-08-24
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Expires: 1966-12-27
Abstract
No abstract record available.
Inventors
- 👤 Harold R Rafton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:19
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/02; C09C1/021; C01; C01P; C01P2006/00; C01P2006/19; C01P2006/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1530949A
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US1764020A
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US1872891A
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US2081112A
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US1943561A
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US2182096A
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US2255213A
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US2323877A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-24 | 1952-02-23 | 1952-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-24 | 1956-02-23 | 1956-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-24 | 1960-02-23 | 1960-08-24 | $7700.00 | Window Closed / Lapsed |