US3407994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shaft seal
Assignee: Hoover Co
•
Filing: 1966-11-15
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Granted: 1968-10-29
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Expires: 1986-11-15
Abstract
No abstract record available.
Inventors
- 👤 Jack D Mckinney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:45
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/08; F04D29/10; F04D29/102; F16; F16J; F16J15/00; F16J15/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-29 | 1972-04-29 | 1972-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-29 | 1976-04-29 | 1976-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-29 | 1980-04-29 | 1980-10-29 | $7700.00 | Window Closed / Lapsed |