US2551223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slant roof ventilator
Assignee: INLAND STEEL PRODUCTS CO
•
Filing: 1945-10-24
•
Granted: 1951-05-01
•
Expires: 1965-10-24
Abstract
No abstract record available.
Inventors
- 👤 George H Schneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:54
CPC Classifications
F; F24; F24F; F24F7/00; F24F7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1264056A
Cited
US1742185A
Cited
US2263879A
Cited
US2300842A
Cited
US2309717A
Cited
US2382076A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-30 | 1954-10-30 | 1955-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-30 | 1958-10-30 | 1959-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-30 | 1962-10-30 | 1963-05-01 | $7700.00 | Window Closed / Lapsed |