US2987295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plug valves
Assignee: Flowserve Corp
•
Filing: 1959-07-24
•
Granted: 1961-06-06
•
Expires: 1979-07-24
Abstract
No abstract record available.
Inventors
- 👤 Robert C Schenck
- 👤 Jacob B Freed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:11
CPC Classifications
F; F16; F16K; F16K5/00; F16K5/02; F16K5/0257; F16K5/0271
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US512892A
Cited
CA532235A
Cited
US1400647A
Cited
US2018034A
Cited
US2011063A
Cited
US2547116A
Cited
US2913219A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-05 | 1964-12-05 | 1965-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-05 | 1968-12-05 | 1969-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-05 | 1972-12-05 | 1973-06-06 | $7700.00 | Window Closed / Lapsed |