Patent US4427340A successfully refreshed from Google Patents.
Patent US3249251A successfully refreshed from Google Patents.
US3249251A
Expired / Lapsed
US
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Thermally insulated and counterweighted roof
Assignee: Conch International Methane Ltd
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Filing: 1963-12-26
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Granted: 1966-05-03
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Expires: 1983-12-26
Abstract
No abstract record available.
Inventors
- 👤 Nachshen Maurice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:17
CPC Classifications
F; F17; F17C; F17C3/00; F17C3/005; E; E04; E04H; E04H7/00; E04H7/02; E04H7/04; E04H7/06; E04H7/065; F17B; F17B1/00; F17C2203/00; F17C2203/06; F17C2203/0634; F17C2203/0678
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A GROUND RESERVOIR FOR STORING LIQUID AT TEMPERATURES CONSIDERABLY BELOW THE FREEZING POINT OF WATER, SAID RESERVOIR COMPRISING A HOLE FORMED IN THE SURFACE OF THE GROUND, A ROOF COVERING THE TOP OF SAID HOLE, SAID ROOF COMPRISING AN IMPERVIOUS THIN LIGHTWEIGHT MEMBRANE SHEET, A MECHANICALLY RIGID OPEN FRAMEWORK SUPERSTRUCTURE, A PLURALITY OF HANGER MEANS UNDER TENSION FOR SUPPORTING SAID SHEET AT A PLURALITY OF POINTS FROM SAID SUPERSTRUCTURE, AND COUNTERWEIGHT MEANS DISTRIBUTED OVER AND SUPPORTED ABOVE SAID SHEET AND BELOW SAID SUPERSTRUCTURE FOR RESISTING UPWARD GAS PRESSURE ACTING ON THE LOWER SURFACE OF SAID SHEET.
Claim 2
Dependent Claim
96 words
A GROUND RESERVOIR FOR STORING LIQUID AT TEMPERATURES CONSIDERABLY BELOW THE FREEZING POINT OF WATER, SAID RESERVOIR COMPRISING A HOLE FORMED IN THE SURFACE OF THE GROUND, A ROOF COVERING THE TOP OF SAID HOLE, SAID ROOF COMPRISING AN IMPERVIOUS THIN LIGHTWEIGHT MEMBRANE SHEET, A MECHANICALLY RIGID OPEN FRAMEWORK SUPERSTRUCTURE, A PLURALITY OF HANGER MEANS UNDER TENSION FOR SUPPORTING SAID SHEET AT A PLURALITY OF POINTS FROM SAID SUPERSTRUCTURE, AND COUNTERWEIGHT MEANS DISTRIBUTED OVER AND SUPPORTED ABOVE SAID SHEET AND BELOW SAID SUPERSTRUCTURE FOR RESISTING UPWARD GAS PRESSURE ACTING ON THE LOWER SURFACE OF SAID SHEET.
References Cited (Backward Citations)
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Cited
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US1866517A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |