Patent US2924367A successfully refreshed from Google Patents.
Patent US2973183A successfully refreshed from Google Patents.
US2973183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low friction sliding valve with edge-sealed ports
Assignee: New York Air Brake LLC
•
Filing: 1958-06-12
•
Granted: 1961-02-28
•
Expires: 1978-06-12
Abstract
No abstract record available.
Inventors
- 👤 Jr Martin J Alger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:35
CPC Classifications
F; F16; F16K; F16K5/00; F16K5/02; F16K5/025
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1979910A
Cited
US2807511A
Cited
US2864579A
Cited
GB770484A
Cited
US2776104A
Cited
US2832563A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-28 | 1964-08-29 | 1965-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-28 | 1968-08-29 | 1969-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-28 | 1972-08-29 | 1973-02-28 | $7700.00 | Window Closed / Lapsed |