US2095643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recuperator
Assignee: Bethlehem Steel Corp
•
Filing: 1937-02-06
•
Granted: 1937-10-12
•
Expires: 1957-02-06
Abstract
No abstract record available.
Inventors
- 👤 Charles E Lehr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:53
CPC Classifications
F; F28; F28F; F28F21/00; F28F21/04; Y; Y10; Y10S; Y10S165/00; Y10S165/051; Y10S165/052; Y10S165/067; Y10S165/068
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) | 1940-10-11 | 1941-04-12 | 1941-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-10-11 | 1945-04-12 | 1945-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-10-11 | 1949-04-12 | 1949-10-12 | $7700.00 | Window Closed / Lapsed |