US2308769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for forming granulated slag
Assignee: WALLACE L CALDWELL
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Filing: 1941-01-21
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Granted: 1943-01-19
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Expires: 1961-01-21
Abstract
No abstract record available.
Inventors
- 👤 Carl F Meinzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:43
CPC Classifications
C; C21; C21B; C21B3/00; C21B3/04; C21B3/06; C21B3/08; C21B2400/00; C21B2400/02; C21B2400/022; C21B2400/024; C21B2400/05; C21B2400/052; C21B2400/054; C21B2400/062
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) | 1946-01-18 | 1946-07-20 | 1947-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-01-18 | 1950-07-20 | 1951-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-01-18 | 1954-07-20 | 1955-01-19 | $7700.00 | Window Closed / Lapsed |