Patent US3547452A successfully refreshed from Google Patents.
US3547452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propeller shaft seal
Assignee: Nok Corp
•
Filing: 1969-01-17
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Granted: 1970-12-15
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Expires: 1989-01-17
Abstract
No abstract record available.
Inventors
- 👤 Michiho Hirata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:33
CPC Classifications
B; B63; B63H; B63H23/00; B63H23/32; B63H23/36; F; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/3436; F16J15/344; Y; Y10; Y10S; Y10S277/00; Y10S277/91; Y10S277/914
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) | 1973-12-14 | 1974-06-15 | 1974-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-14 | 1978-06-15 | 1978-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-14 | 1982-06-15 | 1982-12-15 | $7700.00 | Window Closed / Lapsed |