US2441737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic ventilator fan
Assignee: Individual
•
Filing: 1944-01-03
•
Granted: 1948-05-18
•
Expires: 1964-01-03
Abstract
No abstract record available.
Inventors
- 👤 William W Weich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:09
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/52; F04D29/522; F04D29/526
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1467233A
Cited
US1930794A
Cited
US1767988A
Cited
US1996195A
Cited
US2048985A
Cited
US2054526A
Cited
US2294399A
Cited
US2310772A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-05-18 | 1951-11-17 | 1952-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-05-18 | 1955-11-17 | 1956-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-05-18 | 1959-11-17 | 1960-05-18 | $7700.00 | Window Closed / Lapsed |