Back incline indicator
Patent 4958145 Issued on September 18, 1990. Estimated Expiration Date: 
May 5, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 5, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3362023 3582935 3644919 Shirt-pocket medical alert device Apparatus for detecting unauthorized egress by patient from position of confinement Signalling device for weight lifters In-home emergency assist device Patent #: 4829285 InventorAssigneeApplicationNo. 348212 filed on 05/05/1989US Classes:340/689, Tilt340/573.1, Human or animal434/247, PHYSICAL EDUCATION482/909MECHANICAL INDICATORExaminersPrimary: Swann, III, Glen R.Attorney, Agent or FirmForeign Patent References
International ClassG08B 021/00AbstractA back incline indicator (10) employs a mercury switch (44) and a beeper (72) to indicate to a user (24) whenever the back of the user (24) is bent beyond an acceptable limit, λcrit. The mercury switch (44) and beeper (72) are attached to a casing (38) including a plate (28A) that is parallel to the back of the user (24). The casing (38) is connected by a connector (14) to the shirt collar of the user (24). The mercury switch (44) is set to an angle θ from the plate (28A). The value of θ determines how much the user's back may be bent before λcrit is reached. The value of θ may be set to different amounts as the desired value of λcrit may vary with different uses of the back incline indicator (10).Other References
| |
