US2840111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dampener and floating barrier seal
Assignee: Individual
•
Filing: 1953-07-16
•
Granted: 1958-06-24
•
Expires: 1973-07-16
Abstract
No abstract record available.
Inventors
- 👤 Kerr Ralph Lynn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:24
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/04; F16L55/043; F16L55/045; F16L55/05; F16L55/052; G; G01; G01L; G01L19/00; G01L19/06; G01L19/0609
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |