Patent US3474820A successfully refreshed from Google Patents.
US3474820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Y-pattern corrosion-resistant valve
Assignee: Chevron USA Inc
•
Filing: 1968-12-09
•
Granted: 1969-10-28
•
Expires: 1988-12-09
Abstract
No abstract record available.
Inventors
- 👤 William G O'neill Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:13
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/02; F16K1/06; F16K1/10; F16K1/32; F16K1/34; F16K1/36; F16K1/38; F16K1/385; Y; Y10; Y10T; Y10T137/00; Y10T137/6851; Y10T137/7036
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
FR1182016A
Cited
US3420262A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-27 | 1973-04-28 | 1973-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-27 | 1977-04-28 | 1977-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-27 | 1981-04-28 | 1981-10-28 | $7700.00 | Window Closed / Lapsed |