Patent US3388720A successfully refreshed from Google Patents.
US3388720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Four-way valve
Assignee: Individual
•
Filing: 1965-09-13
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Granted: 1968-06-18
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Expires: 1985-09-13
Abstract
No abstract record available.
Inventors
- 👤 Edward L Parr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:17
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; F16K11/06; F16K11/065; F16K11/07; F15; F15B; F15B13/00; F15B13/02; F15B13/04; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/8667; Y10T137/86694; Y10T137/8671; Y10T137/86879
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1395756A
Cited
US2540467A
Cited
GB830925A
Cited
US2997065A
Cited
US3152614A
Cited
US3049239A
Cited
US3279748A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-18 | 1971-12-18 | 1972-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-18 | 1975-12-18 | 1976-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-18 | 1979-12-18 | 1980-06-18 | $7700.00 | Window Closed / Lapsed |