Patent US2485547A successfully refreshed from Google Patents.
US2485547A
Expired / Lapsed
US
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Anticlogging device for roof drains
Assignee: Individual
•
Filing: 1947-06-14
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Granted: 1949-10-25
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Expires: 1967-06-14
Abstract
No abstract record available.
Inventors
- 👤 James B Blau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:06
CPC Classifications
E; E04; E04D; E04D13/00; E04D13/04; E04D13/076; E04D13/0767; E04D13/0404; E04D13/0409; E04D2013/0413
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US211971A
Cited
US239418A
Cited
GB189415498A
Cited
US664833A
Cited
US686917A
Cited
US1069042A
Cited
US1775048A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-10-24 | 1953-04-25 | 1953-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-10-24 | 1957-04-25 | 1957-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-10-24 | 1961-04-25 | 1961-10-25 | $7700.00 | Window Closed / Lapsed |