Patent US2656509A successfully refreshed from Google Patents.
US437289A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expansible plug for testing pipes
Assignee: —
•
Filing: —
•
Granted: 1890-09-30
•
Expires: 1907-09-30
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:20
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/10; F16L55/12; F16L55/128; F16L55/136; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17128; Y10T279/17171; Y10T279/17179
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1893-09-29 | 1894-03-31 | 1894-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1897-09-29 | 1898-03-31 | 1898-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1901-09-30 | 1902-04-01 | 1902-10-01 | $7700.00 | Window Closed / Lapsed |