US2672983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anticlogging device for roof drains
Assignee: Individual
•
Filing: 1950-07-11
•
Granted: 1954-03-23
•
Expires: 1970-07-11
Abstract
No abstract record available.
Inventors
- 👤 James B Blau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:15
CPC Classifications
E; E04; E04D; E04D13/00; E04D13/04; E04D13/0404; E04D13/0409; E04D2013/0413
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US239418A
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US612598A
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US664833A
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US726371A
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US2090066A
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US2182150A
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US2332965A
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US2421044A
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US2441265A
Cited
US2485547A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-22 | 1957-09-21 | 1958-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-22 | 1961-09-21 | 1962-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-22 | 1965-09-21 | 1966-03-23 | $7700.00 | Window Closed / Lapsed |