Patent US3915752A successfully refreshed from Google Patents.
US3915752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Battery cap with flame barrier vent filter
Assignee: Illinois Tool Works Inc
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Filing: 1974-05-08
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Granted: 1975-10-28
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Expires: 1994-05-08
Abstract
Abstract A flame barrier vent filter for a battery cap is disclosed. The filter has an external domed shape configuration which is achieved by compression of the ends of the filter so that the outer edge of the filter is made substantially nonporous to escaping battery gas. In this manner, any flame that results from ignition of vented gases will tend to be confined in the center of the filter. The filter is made of a material having a low heat conductivity such as polyvinyl flouride, polyethylene or polypropylene or similar materials which resists melting of the cap if a flame does break out.
Inventors
- 👤 George E Gross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:10
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/30; H01M50/308; H01M50/383; H01M50/394; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
86 words
A BATTERY CAP HAVING A CENTRALLY LOCATED CHANNEL IN COMMUNICATION WITH THE INTERIOR PORTION OF SAID BATTERY CAP, A FILTER IN SAID CHANNEL HAVING A FRIST SURFACE WHICH IS IN COMMUNICATION WITH THE SURROUNDING ATMOSPHERE AND A SECOND SURFACE WHICH IS IN COMMUNICATION WITH SAID CHANNEL AND WHICH IS FORMED OF AN INITIALLY POROUS MATERIAL OF A SUBSTANTIALLY UNIFORM CROSS-SECTIONAL AREA WHICH HAS AN OUTER EDGE PORTION THAT IS COMPRESSED SUFFICIENTLY TO RENDER IT SUBSTANTIALLY NONPOROUS WHILE THE CENTRAL AREA REMAINS POROUS TO ESCAPING BATTERY GASES.
Claim 2
Dependent Claim
86 words
A BATTERY CAP HAVING A CENTRALLY LOCATED CHANNEL IN COMMUNICATION WITH THE INTERIOR PORTION OF SAID BATTERY CAP, A FILTER IN SAID CHANNEL HAVING A FRIST SURFACE WHICH IS IN COMMUNICATION WITH THE SURROUNDING ATMOSPHERE AND A SECOND SURFACE WHICH IS IN COMMUNICATION WITH SAID CHANNEL AND WHICH IS FORMED OF AN INITIALLY POROUS MATERIAL OF A SUBSTANTIALLY UNIFORM CROSS-SECTIONAL AREA WHICH HAS AN OUTER EDGE PORTION THAT IS COMPRESSED SUFFICIENTLY TO RENDER IT SUBSTANTIALLY NONPOROUS WHILE THE CENTRAL AREA REMAINS POROUS TO ESCAPING BATTERY GASES.
Claim 3
Dependent Claim
17 words
A battery cap as set forth in claim 1 wherein said filter is made of polyvinyl fluoride.
Claim 4
Dependent Claim
16 words
A battery cap as set forth in claim 1 wherein said filter is made of polyethylene.
Claim 5
Dependent Claim
16 words
A battery cap as set forth in claim 1 wherein said filter is made of polypropylene.
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) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |