Patent US2982299A successfully refreshed from Google Patents.
US2982299A
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Balanced poppet valve
Assignee: Parker Hannifin Corp
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Filing: 1958-05-21
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Granted: 1961-05-02
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Expires: 1978-05-21
Abstract
No abstract record available.
Inventors
- 👤 Kazimierz T Ksieski
- 👤 Samuel D Burton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:17
CPC Classifications
G; G05; G05D; G05D9/00; G05D9/04; F; F16; F16K; F16K31/00; F16K31/12; F16K31/18; F16K31/34; Y; Y10; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7358; Y10T137/7368; Y10T137/7371; Y10T137/7374; Y10T137/7504; Y10T137/7668; Y10T137/8593; Y10T137/86493; Y10T137/86718; Y10T137/86759; Y10T137/86767
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US340112A
Cited
US783528A
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US1484668A
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GB444010A
Cited
US2117044A
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US2347351A
Cited
US2897836A
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US2853101A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-01 | 1964-10-31 | 1965-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-01 | 1968-10-31 | 1969-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-01 | 1972-10-31 | 1973-05-02 | $7700.00 | Window Closed / Lapsed |