US1904697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety draw-off apparatus for hot water systems
Assignee: Individual
•
Filing: 1929-05-21
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Granted: 1933-04-18
•
Expires: 1949-05-21
Abstract
No abstract record available.
Inventors
- 👤 Edward H Ruppert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:16
CPC Classifications
F; F24; F24D; F24D3/00; F24D3/08; F24D3/087; Y; Y10; Y10T; Y10T137/00; Y10T137/4238; Y10T137/4245; Y10T137/4252; Y10T137/4673; Y10T137/4841; Y10T137/6416; Y10T137/8593; Y10T137/85954; Y10T137/85962; Y10T137/86187
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) | 1936-04-17 | 1936-10-17 | 1937-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-04-17 | 1940-10-17 | 1941-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-04-17 | 1944-10-17 | 1945-04-18 | $7700.00 | Window Closed / Lapsed |