US2283131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal blower
Assignee: Allis Chalmers Corp
•
Filing: 1940-07-17
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Granted: 1942-05-12
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Expires: 1960-07-17
Abstract
No abstract record available.
Inventors
- 👤 Melvin C Shaw
- 👤 Gustaf L Kollberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:55
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/08; F04D29/10; F04D29/102; F04D29/104
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) | 1945-05-11 | 1945-11-10 | 1946-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-05-11 | 1949-11-10 | 1950-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-05-11 | 1953-11-10 | 1954-05-12 | $7700.00 | Window Closed / Lapsed |