US2163435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace roof construction
Assignee: MH Detrick Co
•
Filing: 1933-12-01
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Granted: 1939-06-20
•
Expires: 1953-12-01
Abstract
No abstract record available.
Inventors
- 👤 Charles F Pollen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:19
CPC Classifications
F; F27; F27D; F27D1/00; F27D1/0003; F27D1/0023; F27D1/0026; F27D1/02; F27D1/021
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) | 1942-06-19 | 1942-12-19 | 1943-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-06-19 | 1946-12-19 | 1947-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-06-19 | 1950-12-19 | 1951-06-20 | $7700.00 | Window Closed / Lapsed |