US3253732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Evaporation inhibiting device
Assignee: Standard Oil Co
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Filing: 1962-11-30
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Granted: 1966-05-31
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Expires: 1982-11-30
Abstract
No abstract record available.
Inventors
- 👤 Jr John M Dempster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:54
CPC Classifications
B; B65; B65D; B65D88/00; B65D88/34
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
110 words
IN COMBINATION WITH A STORAGE TANK HAVING AN UPRIGHT WALL, AND EVAPORATION-INHIBITING DEVICE COMPRISING: (A) A THIN, FLEXIBLE, SUBSTANTIALLY CIRCULAR BLANKET OF A PLASTIC FOAM WHICH IS SWELLABLE BY SAID VOLATILE LIQUID, (B) A NETWORK OF TAPES, NON-SWELLABLE BY SAID LIQUID, ADHESIVELY SECURED TO AT LEAST ONE SURFACE OF SAID CIRCULAR BLANKET, SAID NETWORK COMPRISING A PLURALITY OF TAPES, NON-SWELLABLE BY SAID LIQUID, UNIFORMLY DISPOSED ALONG RADII OF AT LEAST ONE FACE OF SAID CIRCULAR BLANKET, AND ADHESIVELY SECURED THERETO, AND (C) A SUBSTANTIALLY INFLEXIBLE STIFFENING MEMBER IN THE FORM OF AN ANNULAR RING POSITIONED NEAR THE PERIPHERY OF SAID BLANKET, AND MEANS SECURING SUCH STIFFENING MEMBER TO SAID BLANKET.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-30 | 1969-11-29 | 1970-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-30 | 1973-11-29 | 1974-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-30 | 1977-11-29 | 1978-05-31 | $7700.00 | Window Closed / Lapsed |