US2533402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for preventing clogging of drain troughs
Assignee: Individual
•
Filing: 1948-09-16
•
Granted: 1950-12-12
•
Expires: 1968-09-16
Abstract
No abstract record available.
Inventors
- 👤 Jr William R Schmitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:47
CPC Classifications
E; E04; E04D; E04D13/00; E04D13/04; E04D13/076; E04D13/0767; E04D13/0404; E04D13/0409; E04D2013/0413
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-11 | 1954-06-12 | 1954-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-11 | 1958-06-12 | 1958-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-11 | 1962-06-12 | 1962-12-12 | $7700.00 | Window Closed / Lapsed |