US2528097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve mechanism for steam engines
Assignee: Individual
•
Filing: 1946-05-17
•
Granted: 1950-10-31
•
Expires: 1966-05-17
Abstract
No abstract record available.
Inventors
- 👤 Frank L Weed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:23
CPC Classifications
F; F01; F01B; F01B27/00; F01B27/02; F01B27/04; F01B27/06
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) | 1953-10-30 | 1954-05-01 | 1954-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-30 | 1958-05-01 | 1958-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-30 | 1962-05-01 | 1962-10-31 | $7700.00 | Window Closed / Lapsed |