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Patent US1728577A successfully refreshed from Google Patents.
US1728577A
Expired / Lapsed
US
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Automatic air valve for hydropneumatic tanks
Assignee: Individual
•
Filing: 1928-04-19
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Granted: 1929-09-17
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Expires: 1948-04-19
Abstract
No abstract record available.
Inventors
- 👤 Frederick A Schossow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:27
CPC Classifications
E; E03; E03D; E03D1/00; E03D1/30; E03D1/32; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/3115; Y10T137/3127; Y10T137/313; Y10T137/3133; Y10T137/7722; Y10T137/7781; Y10T137/7793
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) | 1932-09-16 | 1933-03-18 | 1933-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-09-16 | 1937-03-18 | 1937-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-09-16 | 1941-03-18 | 1941-09-17 | $7700.00 | Window Closed / Lapsed |