Patent US2365560A successfully refreshed from Google Patents.
US2365560A
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US
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Method for treating calcium sulphate pigments
Assignee: NL Industries Inc
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Filing: 1943-08-04
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Granted: 1944-12-19
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Expires: 1963-08-04
Abstract
No abstract record available.
Inventors
- 👤 Franklin L Kingsbury
- 👤 Frank J Schultz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:28
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/02; C09C1/025; C01; C01P; C01P2004/00; C01P2004/80
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) | 1947-12-19 | 1948-06-19 | 1948-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-12-19 | 1952-06-19 | 1952-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-12-19 | 1956-06-19 | 1956-12-19 | $7700.00 | Window Closed / Lapsed |