US3497089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for charging a furnace
Assignee: Kerma Corp
•
Filing: 1967-09-29
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Granted: 1970-02-24
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Expires: 1987-09-29
Abstract
No abstract record available.
Inventors
- 👤 Klaus W Forster
- 👤 Donald W Schaper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:56
CPC Classifications
B; B61; B61D; B61D9/00; B61D9/14; C; C21; C21C; C21C5/00; C21C5/28; C21C5/42; C21C5/46; C21C5/466; F; F27; F27D; F27D3/00; F27D3/0025; F27D2003/0034; F27D2003/0059; F27D2003/0085; F27D2003/0089; F27D2003/009; F27D3/12; F27D2003/125; F27D2003/127; F27D99/00; F27D2099/0083; F27D3/14; F27D5/00; F27D5/0068
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-23 | 1973-08-25 | 1974-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-23 | 1977-08-25 | 1978-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-23 | 1981-08-25 | 1982-02-24 | $7700.00 | Window Closed / Lapsed |