US2878989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple length spiral bladed blower wheel
Assignee: Vernco Corp
•
Filing: 1957-01-31
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Granted: 1959-03-24
•
Expires: 1977-01-31
Abstract
No abstract record available.
Inventors
- 👤 Lowell E Sprouse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:57
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/28; F04D29/281; F04D29/282; F04D29/283; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49329
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE212108C
Cited
US272595A
Cited
US1075120A
Cited
GB191314103A
Cited
US1156118A
Cited
US2315407A
Cited
US2724547A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-23 | 1962-09-22 | 1963-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-23 | 1966-09-22 | 1967-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-23 | 1970-09-22 | 1971-03-24 | $7700.00 | Window Closed / Lapsed |