US2889134A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve construction
Assignee: Walworth Co
•
Filing: 1955-08-26
•
Granted: 1959-06-02
•
Expires: 1975-08-26
Abstract
No abstract record available.
Inventors
- 👤 Austin U Bryant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:19
CPC Classifications
F; F16; F16K; F16K3/00; F16K3/02; F16K3/0227; Y; Y10; Y10S; Y10S251/00; Y10S251/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2109042A
Cited
US2594173A
Cited
US2529412A
Cited
US2628060A
Cited
US2547831A
Cited
US2674436A
Cited
GB716610A
Cited
US2747611A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-06-01 | 1962-12-01 | 1963-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-01 | 1966-12-01 | 1967-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-01 | 1970-12-01 | 1971-06-02 | $7700.00 | Window Closed / Lapsed |