US1898569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interlocking valve construction
Assignee: Individual
•
Filing: 1931-09-21
•
Granted: 1933-02-21
•
Expires: 1951-09-21
Abstract
No abstract record available.
Inventors
- 👤 Carl A Pearson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:09
CPC Classifications
F; F16; F16K; F16K5/00; F16K5/08; F16K5/10; F16K5/103; F16K5/106; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87096; Y10T137/87113; Y10T74/00; Y10T74/20; Y10T74/20207; Y10T74/20238; Y10T74/20576; Y10T74/20582; Y10T74/2063; Y10T74/20636; Y10T74/20642
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) | 1936-02-21 | 1936-08-22 | 1937-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-02-21 | 1940-08-22 | 1941-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-02-21 | 1944-08-22 | 1945-02-21 | $7700.00 | Window Closed / Lapsed |