Patent US3810839A successfully refreshed from Google Patents.
US3810839A
Expired / Lapsed
US
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Flexible insulants for containers and conduits
Assignee: Shell USA Inc
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Filing: 1971-12-02
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Granted: 1974-05-14
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Expires: 1991-12-02
Abstract
Abstract AN IMPROVED THERMAL INSULATING MATERIAL FOR SYSTEMS CONTAINING LIQUEFIED GASES AT LOW TEMPERATURES, SAID INSULTANT BEING A HYDROCARBON-BASED FOAM HAVING A FREEZING TEMPERATURE LOWER OR SLIGHTLY HIGHER THAN THE LIQUEFIED GASES.
Inventors
- 👤 L Creaser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:59
CPC Classifications
F; F17; F17C; F17C13/00; F17C13/001; E; E04; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/76; F17C2203/00; F17C2203/03; F17C2203/0304; F17C2203/0329; F17C2221/00; F17C2221/03; F17C2221/032; F17C2221/033; F17C2223/00; F17C2223/01; F17C2223/0146; F17C2223/0153; F17C2223/0161; Y; Y10; Y10S; Y10S220/00; Y10S220/901; Y10S220/902
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-13 | 1977-11-12 | 1978-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-13 | 1981-11-12 | 1982-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-13 | 1985-11-12 | 1986-05-14 | $7700.00 | Window Closed / Lapsed |