US2312898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of bluing coal
Assignee: Wyeth Holdings LLC
•
Filing: 1941-01-09
•
Granted: 1943-03-02
•
Expires: 1961-01-09
Abstract
No abstract record available.
Inventors
- 👤 Garnet P Ham
- 👤 Robert B Barnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:59
CPC Classifications
C; C25; C25D; C25D5/00; C25D5/54; C25D9/00; C25D9/04; C25D9/08; Y; Y10; Y10S; Y10S44/00; Y10S44/904
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) | 1946-03-01 | 1946-08-31 | 1947-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-03-01 | 1950-08-31 | 1951-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-03-01 | 1954-08-31 | 1955-03-02 | $7700.00 | Window Closed / Lapsed |