US2819799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low pressure drain valve
Assignee: Wilkerson Corp
•
Filing: 1955-03-30
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Granted: 1958-01-14
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Expires: 1975-03-30
Abstract
No abstract record available.
Inventors
- 👤 Dewey L Wilkerson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:08
CPC Classifications
F; F16; F16T; F16T1/00; F16T1/12; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7869; Y10T137/794; Y10T137/8049; Y10T137/8122; Y10T137/8593; Y10T137/877; Y10T137/87829; Y10T137/87837; Y10T137/87861; Y10T137/87869
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US809077A
Cited
US922578A
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US996600A
Cited
US1060142A
Cited
US1171959A
Cited
US1548008A
Cited
US2136898A
Cited
US2621885A
Cited
US2512877A
Cited
GB706674A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-13 | 1961-07-15 | 1962-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-13 | 1965-07-15 | 1966-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-13 | 1969-07-15 | 1970-01-14 | $7700.00 | Window Closed / Lapsed |