Patent US3603925A successfully refreshed from Google Patents.
US3603925A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Master cylinder reservoir level indicator
Assignee: Bendix Corp
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Filing: 1968-10-21
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Granted: 1971-09-07
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Expires: 1988-10-21
Abstract
Abstract A reed switch assembly that is integrated with a lid for a fluid reservoir and has a float within which a magnet is affixed to operate the reed switch and close an electrical circuit upon the approach of a predetermined low level of the fluid in the reservoir.
Inventors
- 👤 Harold W Hughes
- 👤 Samuel E Stone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:52
CPC Classifications
H; H01; H01H; H01H36/00; H01H36/02; B; B60; B60T; B60T17/00; B60T17/18; B60T17/22; B60T17/225; G; G01; G01F; G01F23/00; G01F23/30; G01F23/64; G01F23/68; G01F23/70
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
226 words
In a master cylinder: a wall defining a reservoir therewithin; a cover member for closing said reservoir; an annular housing defining a bore therewithin extending from said cover member into said reservoir; an electrically conductive coating on the inner and outer circumferential surfaces of said housing and extending across at least one end of the latter to provide an electrically conductive path between said inner and outer surfaces; magnetically operated switch means having a pair of contacts mounted in said bore; a terminal carried by said housing electrically insulated from said inner and outer surfaces; one of said contacts being connected to said terminal; the other contact engaging said inner surface whereby the other contact is electrically connected to said wall through said coating and said cover member; a float operatively connected to said housing for vertical movement in response to variations in the liquid level within said housing; a magnet mounted in said float for actuating said switch when the liquid level falls to a point disposing the magnet in a position wherein the magnetic field of the latter envelopes said means; and a closure member for one end of said housing; said one end being provided with a pluRality of spaced serrations; said closure member being secured to said housing by deforming said serrations; said coating extending through the recesses defined between said serrations.
Claim 2
Dependent Claim
226 words
In a master cylinder: a wall defining a reservoir therewithin; a cover member for closing said reservoir; an annular housing defining a bore therewithin extending from said cover member into said reservoir; an electrically conductive coating on the inner and outer circumferential surfaces of said housing and extending across at least one end of the latter to provide an electrically conductive path between said inner and outer surfaces; magnetically operated switch means having a pair of contacts mounted in said bore; a terminal carried by said housing electrically insulated from said inner and outer surfaces; one of said contacts being connected to said terminal; the other contact engaging said inner surface whereby the other contact is electrically connected to said wall through said coating and said cover member; a float operatively connected to said housing for vertical movement in response to variations in the liquid level within said housing; a magnet mounted in said float for actuating said switch when the liquid level falls to a point disposing the magnet in a position wherein the magnetic field of the latter envelopes said means; and a closure member for one end of said housing; said one end being provided with a pluRality of spaced serrations; said closure member being secured to said housing by deforming said serrations; said coating extending through the recesses defined between said serrations.
Claim 3
Dependent Claim
221 words
In a master cylinder: a wall defining a reservoir therewithin; a cover member for closing said reservoir; an annular housing defining a bore therewithin extending from said cover member into said reservoir; an electrically conductive coating on the inner and outer circumferential surfaces of said housing and extending across at least one end of the latter to provide an electrically conductive path between said inner and outer surfaces; magnetically operated switch means having a pair of contacts mounted in said bore; a terminal carried by said housing electrically insulated from said inner and outer surfaces; one of said contacts being connected to said terminal; the other contact engaging said inner surface whereby the other contact is electrically connected to said wall through said coating and said cover member; a float operatively connected to said housing for vertical movement in response to variations in the liquid level within said housing; a magnet mounted in said float for actuating said switch when the liquid level falls to a point disposing the magnet in a position wherein the magnetic field of the latter envelops said switch means; and said housing being stepped to defined larger and smaller diameter portions with a shoulder therebetween; said shoulder being formed with spaced serrations extending therearound, said housing being mounted on said cover member by deforming said serrations.
Claim 4
Dependent Claim
221 words
In a master cylinder: a wall defining a reservoir therewithin; a cover member for closing said reservoir; an annular housing defining a bore therewithin extending from said cover member into said reservoir; an electrically conductive coating on the inner and outer circumferential surfaces of said housing and extending across at least one end of the latter to provide an electrically conductive path between said inner and outer surfaces; magnetically operated switch means having a pair of contacts mounted in said bore; a terminal carried by said housing electrically insulated from said inner and outer surfaces; one of said contacts being connected to said terminal; the other contact engaging said inner surface whereby the other contact is electrically connected to said wall through said coating and said cover member; a float operatively connected to said housing for vertical movement in response to variations in the liquid level within said housing; a magnet mounted in said float for actuating said switch when the liquid level falls to a point disposing the magnet in a position wherein the magnetic field of the latter envelops said switch means; and said housing being stepped to defined larger and smaller diameter portions with a shoulder therebetween; said shoulder being formed with spaced serrations extending therearound, said housing being mounted on said cover member by deforming said serrations.
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) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |