US3412929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inline centrifugal fan
Assignee: Greenheck Fan and Ventilator Corp
•
Filing: 1966-12-06
•
Granted: 1968-11-26
•
Expires: 1986-12-06
Abstract
No abstract record available.
Inventors
- 👤 Robert C Greenheck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:22
CPC Classifications
F; F04; F04D; F04D17/00; F04D17/08; F04D17/16; F04D17/165; F04D25/00; F04D25/02; F04D25/08; F04D25/082; F04D29/00; F04D29/58; F04D29/5806
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2284141A
Cited
US2349668A
Cited
US2469820A
Cited
US2464473A
Cited
US3117770A
Cited
US3199774A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-26 | 1972-05-27 | 1972-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-26 | 1976-05-27 | 1976-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-26 | 1980-05-27 | 1980-11-26 | $7700.00 | Window Closed / Lapsed |