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Patent US3515393A successfully refreshed from Google Patents.
US3515393A
Expired / Lapsed
US
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Face seals
Assignee: Pioneer Oil sealing and Moulding Co Ltd
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Filing: 1967-10-10
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Granted: 1970-06-02
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Expires: 1987-10-10
Abstract
No abstract record available.
Inventors
- 👤 Kenneth Metcalfe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:54
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/36; Y; Y10; Y10S; Y10S277/00; Y10S277/916; Y10S277/918
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2598886A
Cited
US2892642A
Cited
US3218086A
Cited
US3189357A
Cited
GB1019025A
Cited
GB1031189A
Cited
GB998478A
Cited
US3314681A
Cited
FR1450663A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-01 | 1973-12-01 | 1974-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-01 | 1977-12-01 | 1978-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-01 | 1981-12-01 | 1982-06-02 | $7700.00 | Window Closed / Lapsed |