US2839286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Checker construction for open hearth furnaces
Assignee: Individual
•
Filing: 1954-06-23
•
Granted: 1958-06-17
•
Expires: 1974-06-23
Abstract
No abstract record available.
Inventors
- 👤 Clarence G Poth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:36
CPC Classifications
C; C03; C03B; C03B5/00; C03B5/16; C03B5/42; C03B5/235; C03B5/237; F; F23; F23N; F23N5/00; F23N5/003; F27; F27B; F27B3/00; F27B3/10; F27B3/26; F27D; F27D1/00; F27D1/04; F27D1/042; F28; F28D; F28D17/00; F28D17/02; Y; Y02; Y02P; Y02P40/00; Y02P40/50; Y10; Y10S; Y10S165/00; Y10S165/009; Y10S165/03; Y10S165/032
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US891991A
Cited
US1687236A
Cited
US1753467A
Cited
US1745131A
Cited
US1902348A
Cited
US1976575A
Cited
GB509961A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |