US2673568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow valve assembly
Assignee: Individual
•
Filing: 1949-01-11
•
Granted: 1954-03-30
•
Expires: 1969-01-11
Abstract
No abstract record available.
Inventors
- 👤 Bernard K Buffington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:47
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/12; E21B43/121; E21B43/122; E21B43/123; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/2934; Y10T137/7722; Y10T137/7781; Y10T137/7784; Y10T137/7785
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1310615A
Cited
US1882060A
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US1918891A
Cited
US2204834A
Cited
US2144833A
Cited
US2210247A
Cited
US2256704A
Cited
US2323893A
Cited
US2366175A
Cited
US2588715A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-29 | 1957-09-28 | 1958-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-29 | 1961-09-28 | 1962-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-29 | 1965-09-28 | 1966-03-30 | $7700.00 | Window Closed / Lapsed |