Patent US2073461A successfully refreshed from Google Patents.
US2073461A
Expired / Lapsed
US
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Apparatus for controlling the flow of gaseous media
Assignee: AT&T Inc
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Filing: 1932-04-06
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Granted: 1937-03-09
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Expires: 1952-04-06
Abstract
No abstract record available.
Inventors
- 👤 Steven S Cerwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:46
CPC Classifications
C; C23; C23D; C23D9/00; G; G01; G01L; G01L11/00; Y; Y10; Y10S; Y10S118/00; Y10S118/19; Y10T; Y10T137/00; Y10T137/8593; Y10T137/85938
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1940-03-08 | 1940-09-07 | 1941-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-03-08 | 1944-09-07 | 1945-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-03-08 | 1948-09-07 | 1949-03-09 | $7700.00 | Window Closed / Lapsed |