US2453009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilating device
Assignee: Lau Blower Co
•
Filing: 1947-03-10
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Granted: 1948-11-02
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Expires: 1967-03-10
Abstract
No abstract record available.
Inventors
- 👤 Karl M Ganger
- 👤 John B Burrowes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:35
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/70; F04D29/701; F04D29/703
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) | 1951-11-02 | 1952-05-03 | 1952-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-02 | 1956-05-03 | 1956-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-02 | 1960-05-03 | 1960-11-02 | $7700.00 | Window Closed / Lapsed |