US1252648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Art of producing aluminum sulfate.
Assignee: Individual
•
Filing: 1916-12-18
•
Granted: 1918-01-08
•
Expires: 1936-12-18
Abstract
No abstract record available.
Inventors
- 👤 Maurice Barnett
- 👤 Louis Burgess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:25
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/04; C01F7/14; C01F7/144
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) | 1921-01-07 | 1921-07-09 | 1922-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1925-01-07 | 1925-07-09 | 1926-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1929-01-07 | 1929-07-09 | 1930-01-08 | $7700.00 | Window Closed / Lapsed |