Patent US2752087A successfully refreshed from Google Patents.
US2752087A
Expired / Lapsed
US
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Device for airing water tanks
Assignee: CHARLES W COGDELL
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Filing: 1952-08-25
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Granted: 1956-06-26
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Expires: 1972-08-25
Abstract
No abstract record available.
Inventors
- 👤 Reynolds E Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:10
CPC Classifications
E; E03; E03B; E03B11/00; E03B11/02; E03B11/06; Y; Y02; Y02A; Y02A20/00; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/3115; Y10T137/3127; Y10T137/3137
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) | 1959-06-26 | 1959-12-26 | 1960-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-26 | 1963-12-26 | 1964-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-26 | 1967-12-26 | 1968-06-26 | $7700.00 | Window Closed / Lapsed |