US3473555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid flow precluding tool
Assignee: Expando Seal Tools Inc
•
Filing: 1967-08-15
•
Granted: 1969-10-21
•
Expires: 1987-08-15
Abstract
No abstract record available.
Inventors
- 👤 John E Martin
- 👤 Julian G Czeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:39
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/10; F16L55/12; F16L55/128; F16L55/136; Y; Y10; Y10T; Y10T137/00; Y10T137/598; Y10T137/6109; Y10T137/6113
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2176260A
Cited
US2228241A
Cited
US2256775A
Cited
US2810401A
Cited
US3032069A
Cited
US3275023A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |