US3273741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air barrier means for hydropneumatic tank
Assignee: —
•
Filing: —
•
Granted: 1966-09-20
•
Expires: 1983-09-20
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:04
CPC Classifications
E; E03; E03B; E03B11/00; E03B11/02; F; F16; F16L; F16L55/00; F16L55/04; F16L55/045; F16L55/05; F16L55/052
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
103 words
A PRESSURE WATER RESERVOIR COMPRISING AN INTEGRAL TANK; A FREE FLOATING SUBSTANTIALLY RIGID AIR BARRIER MEANS WITHIN SAID TANK AND ADAPTED TO FLOAT ON THE TOP SURFACE OF WATER WITHIN SAID TANK; SAID FREE FLOATING AIR BARRIER MEANS BEING COMPRISED OF A FLOAT FORMED OF EXPANDED POLYSTYRENE WHICH HAS A SPECIFIC GRAVITY OF LESS THAN 1, SAID FLOAT HAVING A TRANSVERSE CENTRAL WEB PORTION, AND A MULTIPLICITY OF SPACED APART INTERSECTING RIBS EXTENDING FROM EACH SIDE OF SAID TRANSVERSE CENTRAL WEB PORTION, SAID SPACED APART INTERSECTING RIBS FORMING A MULTIPLICITY OF POCKETS OPEN AT THEIR OUTER FACES ON EACH SIDE OF SAID FLOAT.
References Cited (Backward Citations)
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Cited
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US2880759A
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Cited
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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) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |