US2476907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipe-line stopper
Assignee: Individual
•
Filing: 1945-07-07
•
Granted: 1949-07-19
•
Expires: 1965-07-07
Abstract
No abstract record available.
Inventors
- 👤 William E Preston
- 👤 Albert L Cappelen
- 👤 Donald B Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:24
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/10; F16L55/12; F16L55/124
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1885896A
Cited
US1879160A
Cited
US2285393A
Cited
US2285392A
Cited
US2272734A
Cited
US2285779A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-07-18 | 1953-01-17 | 1953-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-18 | 1957-01-17 | 1957-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-18 | 1961-01-17 | 1961-07-19 | $7700.00 | Window Closed / Lapsed |