Patent US3229713A successfully refreshed from Google Patents.
US3229713A
Expired / Lapsed
US
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Pressure control valve
Assignee: Individual
•
Filing: 1962-11-06
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Granted: 1966-01-18
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Expires: 1982-11-06
Abstract
No abstract record available.
Inventors
- 👤 Charles W Wiegand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:59
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/02; F16K17/04; F16K17/042; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7734; Y10T137/7738
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) | 1969-01-17 | 1969-07-19 | 1970-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-17 | 1973-07-19 | 1974-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-17 | 1977-07-19 | 1978-01-18 | $7700.00 | Window Closed / Lapsed |