US2474966A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing selenium
Assignee: Hartford National Bank and Trust Co
•
Filing: 1946-05-09
•
Granted: 1949-07-05
•
Expires: 1966-05-09
Abstract
No abstract record available.
Inventors
- 👤 Addink Nicolaas Willem Hendrik
- 👤 Hekelaar Maarten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:43
CPC Classifications
H; H10; H10D; H10D48/00; H10D48/01; H10D48/04; H10D48/043; C; C01; C01B; C01B19/00; C01B19/02; C01P; C01P2002/00; C01P2002/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1456532A
Cited
US1415526A
Cited
US1915703A
Cited
US2162613A
Cited
US2111112A
Cited
US2255358A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-07-04 | 1953-01-03 | 1953-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-04 | 1957-01-03 | 1957-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-04 | 1961-01-03 | 1961-07-05 | $7700.00 | Window Closed / Lapsed |