US3384340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Butterfly valve for high vacuum service
Assignee: Henry Pratt Co LLC
•
Filing: 1965-06-25
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Granted: 1968-05-21
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Expires: 1985-06-25
Abstract
No abstract record available.
Inventors
- 👤 Donald G Fawkes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:45
CPC Classifications
F; F16; F16K; F16K27/00; F16K27/02; F16K27/0209; F16K27/0218; F16K1/00; F16K1/16; F16K1/18; F16K1/22; F16K1/226; F16K1/2261; F16K51/00; F16K51/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3126193A
Cited
US1629627A
Cited
US2058996A
Cited
GB518285A
Cited
US2886062A
Cited
FR1154823A
Cited
FR1255873A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-21 | 1971-11-20 | 1972-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-21 | 1975-11-20 | 1976-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-21 | 1979-11-20 | 1980-05-21 | $7700.00 | Window Closed / Lapsed |