Patent US2938704A successfully refreshed from Google Patents.
US2938704A
Expired / Lapsed
US
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Seal for reciprocating valve
Assignee: Specialties Development Corp
•
Filing: 1957-04-02
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Granted: 1960-05-31
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Expires: 1977-04-02
Abstract
No abstract record available.
Inventors
- 👤 Bernard W Quail
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:33
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; F16K11/06; F16K11/065; F16K11/07; F16K11/0712; F16K41/00; F16K41/02; F16K41/04; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/8667
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2348548A
Cited
US2494598A
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US2645450A
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US2701155A
Cited
GB734691A
Cited
US2747611A
Cited
USRE24440E
Cited
GB753854A
Cited
US2800376A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-31 | 1963-11-30 | 1964-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-31 | 1967-11-30 | 1968-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-31 | 1971-11-30 | 1972-05-31 | $7700.00 | Window Closed / Lapsed |