Patent DE53847C successfully refreshed from Google Patents.
Patent US1851913A successfully refreshed from Google Patents.
US1851913A
Expired / Lapsed
US
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Heat treating apparatus
Assignee: Individual
•
Filing: 1931-02-24
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Granted: 1932-03-29
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Expires: 1951-02-24
Abstract
No abstract record available.
Inventors
- 👤 Edward A Lange
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:48
CPC Classifications
F; F27; F27D; F27D3/00; F27D3/02; F27D3/022; F27D3/024; F27B; F27B9/00; F27B9/14; F27B9/20; F27B9/26
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) | 1935-03-29 | 1935-09-28 | 1936-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-03-29 | 1939-09-28 | 1940-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-03-29 | 1943-09-28 | 1944-03-29 | $7700.00 | Window Closed / Lapsed |