Patent US1842609A successfully refreshed from Google Patents.
US1842609A
Expired / Lapsed
US
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Method of utilizing free oxygen in the production of cement and iron
Assignee: Individual
•
Filing: 1929-03-12
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Granted: 1932-01-26
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Expires: 1949-03-12
Abstract
No abstract record available.
Inventors
- 👤 Charles B Hillhouse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:02
CPC Classifications
C; C22; C22B; C22B7/00; C22B7/02; C21; C21B; C21B13/00; C21B13/0073; C21B13/14; C21B3/00; C21B3/04; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134; Y02P10/20; Y02W; Y02W30/00; Y02W30/50
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) | 1935-01-25 | 1935-07-27 | 1936-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-01-25 | 1939-07-27 | 1940-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-01-25 | 1943-07-27 | 1944-01-26 | $7700.00 | Window Closed / Lapsed |