Patent US2748569A successfully refreshed from Google Patents.
US2748569A
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Controlling delivery of air to induction and blow down type wind tunnels
Assignee: Pittsburgh Des Moines Steel Co
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Filing: 1950-11-14
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Granted: 1956-06-05
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Expires: 1970-11-14
Abstract
No abstract record available.
Inventors
- 👤 James O Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:46
CPC Classifications
F; F04; F04F; F04F5/00; F04F5/44; F04F5/48; F04F5/14; F04F5/16; F16; F16K; F16K31/00; F16K31/12; F16K31/122; F16K31/124; G; G01; G01M; G01M9/00; G01M9/02; G01M9/04; G05; G05D; G05D7/00; G05D7/03; Y; Y10; Y10S; Y10S60/00; Y10S60/911; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7758; Y10T137/7762
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-05 | 1959-12-05 | 1960-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-05 | 1963-12-05 | 1964-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-05 | 1967-12-05 | 1968-06-05 | $7700.00 | Window Closed / Lapsed |