Patent US1538049A successfully refreshed from Google Patents.
US1538049A
Expired / Lapsed
US
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Automatic air valve for hot-water radiation
Assignee: Individual
•
Filing: 1921-04-11
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Granted: 1925-05-19
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Expires: 1941-04-11
Abstract
No abstract record available.
Inventors
- 👤 Edwin Z Mack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:41
CPC Classifications
F; F24; F24D; F24D19/00; F24D19/08; F24D19/082; F24D19/083; F24D19/085; F24D19/087; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/3003; Y10T137/3084; Y10T137/309; Y10T137/3099; Y10T137/7287; Y10T137/7358; Y10T137/7381; Y10T137/7387
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) | 1928-05-18 | 1928-11-17 | 1929-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-05-18 | 1932-11-17 | 1933-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-05-18 | 1936-11-17 | 1937-05-19 | $7700.00 | Window Closed / Lapsed |