Patent US1976532A successfully refreshed from Google Patents.
US1976532A
Expired / Lapsed
US
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Sealing means for centrifugal pumps
Assignee: AR Wilfley and Sons Inc
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Filing: 1934-01-09
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Granted: 1934-10-09
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Expires: 1954-01-09
Abstract
No abstract record available.
Inventors
- 👤 Elmer R Wilfley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:17
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/08; F04D29/10; F04D29/14; F04D29/146
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) | 1937-10-08 | 1938-04-09 | 1938-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-10-08 | 1942-04-09 | 1942-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-10-08 | 1946-04-09 | 1946-10-09 | $7700.00 | Window Closed / Lapsed |