US2230056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic expansion valve
Assignee: Individual
•
Filing: 1937-04-21
•
Granted: 1941-01-28
•
Expires: 1957-04-21
Abstract
No abstract record available.
Inventors
- 👤 William C Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:37
CPC Classifications
F; F25; F25B; F25B41/00; F25B41/30; F25B41/31; F25B41/33; F25B41/335; Y; Y10; Y10T; Y10T137/00; Y10T137/1842; Y10T137/1939; Y10T137/1963; Y10T137/6416; Y10T137/6579; Y10T137/7722; Y10T137/7737; Y10T137/7781; Y10T137/7782
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) | 1944-01-28 | 1944-07-29 | 1945-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-01-28 | 1948-07-29 | 1949-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-01-28 | 1952-07-29 | 1953-01-28 | $7700.00 | Window Closed / Lapsed |