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US5674380A
Expired / Lapsed
US
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Oil filter and filter blockage alarming system
Assignee: Individual
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Filing: 1995-08-22
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Granted: 1997-10-07
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Expires: 2015-08-22
Abstract
Abstract A lubricating oil filter and filter blockage alarm system for internal combustion engines. At least one filter element is disposed within a housing. A condition representing a degree of blockage of the filter element is sensed and, if a blockage threshold is exceeded, an alarm is triggered. There is provided an electrical connection between the sensor and the alarm system. The connection is a pair of series-connected platinum conductors that are insulated from contact with the oil being filtered, thereby assuring the triggering of the alarm.
Inventors
- 👤 Matei Cioara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:44
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/14; B01D35/143; B01D24/00; B01D24/007; B01D24/008; B01D24/02; B01D24/04; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/21; B01D29/50; B01D29/56; B01D29/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A lubricating oil filter and filter blockage alarm system for internal combustion engines, comprising: a housing; at least one filter element disposed within the housing; means for sensing a condition representing a degree of blockage of the at least one filter element; means for alarming responsive to the means for sensing; and means for providing electrical connection between the means for sensing and means for alarming including a pair of series-connected platinum conductors that are insulated from contact with the oil being filtered, thereby assuring functioning of the means for alarming.
Claim 2
Dependent Claim
91 words
A lubricating oil filter and filter blockage alarm system for internal combustion engines, comprising: a housing; at least one filter element disposed within the housing; means for sensing a condition representing a degree of blockage of the at least one filter element; means for alarming responsive to the means for sensing; and means for providing electrical connection between the means for sensing and means for alarming including a pair of series-connected platinum conductors that are insulated from contact with the oil being filtered, thereby assuring functioning of the means for alarming.
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) | 2000-10-06 | 2001-04-07 | 2001-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-10-06 | 2005-04-07 | 2005-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-10-06 | 2009-04-07 | 2009-10-07 | $7700.00 | Window Closed / Lapsed |