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Patent US3447810A successfully refreshed from Google Patents.
US3447810A
Expired / Lapsed
US
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Shaft seals
Assignee: Gorman Rupp Co
•
Filing: 1965-10-07
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Granted: 1969-06-03
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Expires: 1985-10-07
Abstract
No abstract record available.
Inventors
- 👤 Robert J Porter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:21
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/36; F16J15/363; F16J15/366; Y; Y10; Y10S; Y10S277/00; Y10S277/91
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2884268A
Cited
US2989966A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |