US2428751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve and switch unit
Assignee: Detroit Lubricator Co
•
Filing: 1944-11-29
•
Granted: 1947-10-07
•
Expires: 1964-11-29
Abstract
No abstract record available.
Inventors
- 👤 Andrew K Foulds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:14
CPC Classifications
F; F23; F23D; F23D5/00; F23D5/12; F23D5/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2275962A
Cited
US1635634A
Cited
US1700428A
Cited
US2067681A
Cited
US2207771A
Cited
US2187045A
Cited
US2286137A
Cited
US2267187A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-06 | 1951-04-07 | 1951-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-06 | 1955-04-07 | 1955-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-06 | 1959-04-07 | 1959-10-07 | $7700.00 | Window Closed / Lapsed |