Patent US3795728A successfully refreshed from Google Patents.
US3795728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing phosphoric acid and substantially alkalisilico-fluoride-free gypsum
Assignee: Knauf Gips KG
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Filing: 1972-03-01
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Granted: 1974-03-05
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Expires: 1992-03-01
Abstract
Abstract PROCESS FOR THE MANUFACTURE OF PHOSPHORIC ACID AND THE OBTAINING OF AN ESSENTIALLY ALKALI-SILICO-FLUORIDE FREE GYPSUM AS A BYPRODUCT.
Inventors
- 👤 K Scheel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:47
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/08; C01B33/10; C01B33/103; 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) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |