US2883997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Relay valves
Assignee: Midland Steel Products Co
•
Filing: 1954-12-27
•
Granted: 1959-04-28
•
Expires: 1974-12-27
Abstract
No abstract record available.
Inventors
- 👤 Forrest O E Schultz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:14
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/126; B; B60; B60T; B60T13/00; B60T13/10; B60T13/24; B60T13/26; B60T13/40; B60T15/00; B60T15/02; B60T15/18; B60T15/20; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2544
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2168748A
Cited
US2411406A
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US2441050A
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US2577967A
Cited
US2493449A
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US2490420A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-27 | 1962-10-27 | 1963-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-27 | 1966-10-27 | 1967-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-27 | 1970-10-27 | 1971-04-28 | $7700.00 | Window Closed / Lapsed |