US3380475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gate valve
Assignee: OB Armstrong & Son
•
Filing: 1965-06-24
•
Granted: 1968-04-30
•
Expires: 1985-06-24
Abstract
No abstract record available.
Inventors
- 👤 George W Armstrong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:39
CPC Classifications
B; B65; B65D; B65D90/00; B65D90/54; B65D90/58; B65D90/582; B65D90/60; F; F16; F16K; F16K13/00; F16K13/02; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/877; Y10T137/87893
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-30 | 1971-10-30 | 1972-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-30 | 1975-10-30 | 1976-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-30 | 1979-10-30 | 1980-04-30 | $7700.00 | Window Closed / Lapsed |