Patent US3428296A successfully refreshed from Google Patents.
US3428296A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety cover for valves
Assignee: Individual
•
Filing: 1966-01-12
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Granted: 1969-02-18
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Expires: 1986-01-12
Abstract
No abstract record available.
Inventors
- 👤 Victor Erickson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:50
CPC Classifications
F; F01; F01L; F01L3/00; F01L3/10; F01L3/24; F01L2303/00; F01L2303/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1457957A
Cited
US1420898A
Cited
US1460538A
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US1684745A
Cited
US1711267A
Cited
US2142224A
Cited
US2470327A
Cited
US2516795A
Cited
US2780071A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |