US2353538A
Expired / Lapsed
US
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Apparatus for controlling gaseous atmosphere
Assignee: Individual
•
Filing: 1940-04-23
•
Granted: 1944-07-11
•
Expires: 1960-04-23
Abstract
No abstract record available.
Inventors
- 👤 Hervey H Barber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:18
CPC Classifications
A; A23; A23B; A23B2/00; A23B2/70; A23B2/704; A23B2/7045; G; G01; G01N; G01N9/00; G01N9/10; G01N9/12; G01N9/16; G05; G05D; G05D11/00; G05D11/02; G05D11/13; G05D21/00; G05D21/02; Y; Y10; Y10T; Y10T137/00; Y10T137/1842; Y10T137/1939; Y10T137/2496; Y10T137/2499; Y10T137/2504; Y10T137/2931; Y10T137/7722; Y10T137/7758
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) | 1947-07-11 | 1948-01-10 | 1948-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-07-11 | 1952-01-10 | 1952-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-07-11 | 1956-01-10 | 1956-07-11 | $7700.00 | Window Closed / Lapsed |