Patent US2620207A successfully refreshed from Google Patents.
US2620207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glandless seal for centrifugal pumps
Assignee: AR Wilfley and Sons Inc
•
Filing: 1949-07-19
•
Granted: 1952-12-02
•
Expires: 1969-07-19
Abstract
No abstract record available.
Inventors
- 👤 Elmer R Wilfley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:50
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/164; F04; F04D; F04D29/00; F04D29/08; F04D29/10; F04D29/14; F04D29/146
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1556657A
Cited
US1960750A
Cited
US1931724A
Cited
US1976532A
Cited
GB542218A
Cited
US2272454A
Cited
US2397486A
Cited
US2560557A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-02 | 1956-06-02 | 1956-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-02 | 1960-06-02 | 1960-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-02 | 1964-06-02 | 1964-12-02 | $7700.00 | Window Closed / Lapsed |