US2520540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scum breaker
Assignee: Infilco Inc
•
Filing: 1946-10-03
•
Granted: 1950-08-29
•
Expires: 1966-10-03
Abstract
No abstract record available.
Inventors
- 👤 Walter H Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:18
CPC Classifications
B; B01; B01D; B01D19/00; B01D19/02; Y; Y10; Y10S; Y10S159/00; Y10S159/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US727032A
Cited
US1084210A
Cited
US1375406A
Cited
US1757263A
Cited
US1989589A
Cited
US2122287A
Cited
US2289645A
Cited
US2424679A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-28 | 1954-02-27 | 1954-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-28 | 1958-02-27 | 1958-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-28 | 1962-02-27 | 1962-08-29 | $7700.00 | Window Closed / Lapsed |