Patent US3515497A successfully refreshed from Google Patents.
US3515497A
Expired / Lapsed
US
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Centrifugal pump having hydraulic seal means
Assignee: AR Wilfley and Sons Inc
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Filing: 1968-08-27
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Granted: 1970-06-02
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Expires: 1988-08-27
Abstract
No abstract record available.
Inventors
- 👤 James B Studebaker
- 👤 Irvin F Zagar
- 👤 Lawrence T Gobble
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:08
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/08; F04D29/10; F04D29/14; F04D29/146; Y; Y10; Y10S; Y10S277/00; Y10S277/929
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) | 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 |