US1994271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making an alkaline earth metal carbonate of improved color
Assignee: PURE CALCIUM PRODUCTS Co
•
Filing: 1933-02-23
•
Granted: 1935-03-12
•
Expires: 1953-02-23
Abstract
No abstract record available.
Inventors
- 👤 John W Church
- 👤 Raymond R Mcclure
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:33
CPC Classifications
C; C01; C01F; C01F11/00; C01F11/18
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1938-03-11 | 1938-09-10 | 1939-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-03-11 | 1942-09-10 | 1943-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-03-11 | 1946-09-10 | 1947-03-12 | $7700.00 | Window Closed / Lapsed |