Patent US6997951B2 successfully refreshed from Google Patents.
Patent US2760894A successfully refreshed from Google Patents.
US2760894A
Expired / Lapsed
US
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Unvulcanized elastomers containing silica
Assignee: Columbia Southern Chemical Corp
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Filing: 1953-06-29
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Granted: 1956-08-28
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Expires: 1973-06-29
Abstract
No abstract record available.
Inventors
- 👤 Ralph F Wolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:35
CPC Classifications
B; B60; B60K; B60K15/00; B60K15/03; B60K15/03177; C; C08; C08K; C08K3/00; C08K3/34; C08K3/36; Y; Y10; Y10S; Y10S220/00; Y10S220/90; Y10S220/901; Y10S516/00; Y10S516/922; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495; Y10T152/10666; Y10T152/10675
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A MULTIPLE LAYER, SELF-SEALING FUEL TANK HAVING AN INTERMEDIATE SEALING LAYER SWELLABLE IN HYDROCARBON OILS BUT NORMALLY OUT OF CONTACT WITH SUCH OILS, SAID LAYER COMPRISING UNVULCANIZED NATURAL RUBBER CONTAINING FROM ABOUT 5 TO 30 VOLUMES OF FINELY DIVIDED, HYDRATED SILICA PER 100 VOLUMES OF RUBBER, AN INNER LAYER OF A FLEXIBLE MATERIAL RESISTANT TO HYDROCARBON OILS AND AN OUTER LAYER WHICH LENDS RIGIDITY TO THE TANK.
Claim 2
Dependent Claim
67 words
A MULTIPLE LAYER, SELF-SEALING FUEL TANK HAVING AN INTERMEDIATE SEALING LAYER SWELLABLE IN HYDROCARBON OILS BUT NORMALLY OUT OF CONTACT WITH SUCH OILS, SAID LAYER COMPRISING UNVULCANIZED NATURAL RUBBER CONTAINING FROM ABOUT 5 TO 30 VOLUMES OF FINELY DIVIDED, HYDRATED SILICA PER 100 VOLUMES OF RUBBER, AN INNER LAYER OF A FLEXIBLE MATERIAL RESISTANT TO HYDROCARBON OILS AND AN OUTER LAYER WHICH LENDS RIGIDITY TO THE TANK.
References Cited (Backward Citations)
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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) | 1959-08-28 | 1960-02-27 | 1960-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-28 | 1964-02-27 | 1964-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-28 | 1968-02-27 | 1968-08-28 | $7700.00 | Window Closed / Lapsed |