US2448740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing stable colloidal solutions of metal sulfides
Assignee: Individual
•
Filing: 1945-10-15
•
Granted: 1948-09-07
•
Expires: 1965-10-15
Abstract
No abstract record available.
Inventors
- 👤 Schwartz Fernand Frederic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:16
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/0004; B01J13/0026; B01J13/0008; B01J13/0013; C; C01; C01G; C01G1/00; C01G1/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB115236A
Cited
US1502285A
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US1429522A
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GB353970A
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US1922006A
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US2060311A
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US2201124A
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DE707756C
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-09-07 | 1952-03-08 | 1952-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-07 | 1956-03-08 | 1956-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-07 | 1960-03-08 | 1960-09-07 | $7700.00 | Window Closed / Lapsed |