US2725074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bi-directional flow valve structure
Assignee: Detroit Harvester Co
•
Filing: 1950-03-27
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Granted: 1955-11-29
•
Expires: 1970-03-27
Abstract
No abstract record available.
Inventors
- 👤 Stewart B Mcleod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:15
CPC Classifications
F; F04; F04B; F04B49/00; F04B49/02; F04B49/03; F04B49/035; F04C; F04C2/00; F04C2/08; F04C2/10; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7771; Y10T137/778; Y10T137/7837; Y10T137/7838; Y10T137/7846; Y10T137/7869; Y10T137/8593; Y10T137/85978; Y10T137/86171
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US633706A
Cited
US807269A
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US1779251A
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US2069366A
Cited
GB519031A
Cited
US2367682A
Cited
US2426065A
Cited
US2483312A
Cited
US2473043A
Cited
US2472544A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-11-28 | 1959-05-30 | 1959-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-28 | 1963-05-30 | 1963-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-28 | 1967-05-30 | 1967-11-29 | $7700.00 | Window Closed / Lapsed |