Patent US2621668A successfully refreshed from Google Patents.
US2621668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic impact device for cleaning pipes
Assignee: Individual
•
Filing: 1946-05-03
•
Granted: 1952-12-16
•
Expires: 1966-05-03
Abstract
No abstract record available.
Inventors
- 👤 Jay G Crispin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:51
CPC Classifications
B; B08; B08B; B08B9/00; B08B9/02; B08B9/027; B08B9/04; B08B9/043; B08B9/0436
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US105015A
Cited
US952130A
Cited
US1039980A
Cited
US1238269A
Cited
US1628833A
Cited
US2028779A
Cited
US2052563A
Cited
US2102591A
Cited
US2147593A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-16 | 1956-06-16 | 1956-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-16 | 1960-06-16 | 1960-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-16 | 1964-06-16 | 1964-12-16 | $7700.00 | Window Closed / Lapsed |