US3410655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of alpha-calcium sulfate hemihydrate
Assignee: BK Giulini Chemie GmbH
•
Filing: 1966-02-24
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Granted: 1968-11-12
•
Expires: 1986-02-24
Abstract
No abstract record available.
Inventors
- 👤 Ruter Hermann
- 👤 Cherdron Egon
- 👤 Fassle Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:23
CPC Classifications
C; C04; C04B; C04B11/00; C04B11/02; C04B11/024; C01; C01F; C01F11/00; C01F11/46; C01F11/466
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1943497A
Cited
US2913308A
Cited
US2907668A
Cited
US3081152A
Cited
DE1157128B
Cited
US3199997A
Cited
GB999487A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-12 | 1972-05-13 | 1972-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-12 | 1976-05-13 | 1976-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-12 | 1980-05-13 | 1980-11-12 | $7700.00 | Window Closed / Lapsed |