US3477456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve
Assignee: Anderson Greenwood and Co
•
Filing: 1967-04-03
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Granted: 1969-11-11
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Expires: 1987-04-03
Abstract
No abstract record available.
Inventors
- 👤 Walter W Powell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:01
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/02; F16K17/04; F16K17/10; F16K17/105; F16K21/00; F16K21/04; F16K21/18; F16K31/00; F16K31/12; F16K31/126; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/3003; Y10T137/3115; Y10T137/3127; Y10T137/7287; Y10T137/7358; Y10T137/7368; Y10T137/7371; Y10T137/7378; Y10T137/7722; Y10T137/7758; Y10T137/7762; Y10T137/7764; Y10T137/7769; Y10T137/777
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) | 1972-11-10 | 1973-05-12 | 1973-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-10 | 1977-05-12 | 1977-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-10 | 1981-05-12 | 1981-11-11 | $7700.00 | Window Closed / Lapsed |