US2679863A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Balanced flexible curtain type valve
Assignee: Individual
•
Filing: 1951-07-12
•
Granted: 1954-06-01
•
Expires: 1971-07-12
Abstract
No abstract record available.
Inventors
- 👤 Welsey L Tucker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:48
CPC Classifications
A; A01; A01K; A01K7/00; A01K7/02; A01K7/04; F; F16; F16K; F16K31/00; F16K31/12; F16K31/18; F16K31/20; F16K31/24; F16K7/00; F16K7/18; Y; Y10; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7358; Y10T137/7439; Y10T137/7494; Y10T137/8593; Y10T137/86493; Y10T137/86718
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US601634A
Cited
US1138994A
Cited
US1153343A
Cited
US1685527A
Cited
US2343584A
Cited
US2353641A
Cited
US2608204A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-31 | 1957-11-30 | 1958-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-31 | 1961-11-30 | 1962-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-31 | 1965-11-30 | 1966-06-01 | $7700.00 | Window Closed / Lapsed |