US2973006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow control device
Assignee: Koehring Co
•
Filing: 1957-09-30
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Granted: 1961-02-28
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Expires: 1977-09-30
Abstract
No abstract record available.
Inventors
- 👤 Wayne F Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:15
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/10; E21B2200/00; E21B2200/05; F; F16; F16K; F16K15/00; F16K15/14; F16K15/16; F16K15/161; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7771; Y10T137/778
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) | 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 |