Patent US2316343A successfully refreshed from Google Patents.
US2316343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of calcium sulphate
Assignee: Individual
•
Filing: 1938-12-19
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Granted: 1943-04-13
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Expires: 1958-12-19
Abstract
No abstract record available.
Inventors
- 👤 Kubelka Paul
- 👤 Reiner Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:29
CPC Classifications
C; C04; C04B; C04B11/00; C04B11/02; C04B11/024; C01; C01F; C01F11/00; C01F11/46
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) | 1946-04-12 | 1946-10-12 | 1947-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-04-12 | 1950-10-12 | 1951-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-04-12 | 1954-10-12 | 1955-04-13 | $7700.00 | Window Closed / Lapsed |