Patent US3189181A successfully refreshed from Google Patents.
US3189181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Underdrain construction for tanks
Assignee: Crane Co
•
Filing: 1961-04-24
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Granted: 1965-06-15
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Expires: 1981-04-24
Abstract
No abstract record available.
Inventors
- 👤 Couse John Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:55
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/42
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
78 words
LIQUID TREATING APPARATUS COMPRISING A TANK, A HEADER WITHIN SAID TANK EXTENDING ACROSS THE BOTTOM THEREOF, AT LEAST ONE PLASTIC TUBE EXTENDING LATERALLY FROM SAID HEADER, MEANS DEFINING A PASSAGEWAY EXTENDING FROM THE EXTERIOR OF SAID TUBE TO THE INTERIOR OF SAID HEADER INCLUDING A PLURALITY OF OPENINGS IN SAID TUBE SPACED LONGITUDINALLY THEREOF, MEANS PROVIDING FOR FLUID COMMUNICATION BETWEEN THE INTERIOR OF SAID HEADER AND THE EXTERIOR OF THE TANK, AN ELONGATED SCREEN OF A CORROSION RESISTANT
References Cited (Backward Citations)
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-06-14 | 1968-12-14 | 1969-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-14 | 1972-12-14 | 1973-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-14 | 1976-12-14 | 1977-06-15 | $7700.00 | Window Closed / Lapsed |