US2205305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prevention of reverse flow in water supply systems
Assignee: Individual
•
Filing: 1937-04-16
•
Granted: 1940-06-18
•
Expires: 1957-04-16
Abstract
No abstract record available.
Inventors
- 👤 Northon Louis Irving
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:00
CPC Classifications
E; E03; E03B; E03B7/00; E03B7/04; E03C; E03C1/00; E03C1/02; E03C1/10; E03C1/102; Y; Y10; Y10T; Y10T137/00; Y10T137/3149; Y10T137/3185; Y10T137/3222; Y10T137/8593
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) | 1943-06-18 | 1943-12-18 | 1944-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-06-18 | 1947-12-18 | 1948-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-06-18 | 1951-12-18 | 1952-06-18 | $7700.00 | Window Closed / Lapsed |