Laser removal of material from workpieces
Patent 4087672 Issued on May 2, 1978. Estimated Expiration Date: 
May 2, 1995. 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 2, 1995. 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 3168418 3291959 3297944 3303319 3316386 3347701 3439263 3636251 InventorAssigneeApplicationNo. 703196 filed on 07/07/1976US Classes:219/121.68, Etching or trimming219/121.19, Etching or trimming219/121.34, Power supply219/121.62, Condition responsive324/71.2, Erosion347/246, Feedback of light for intensity control347/247Driving circuitryExaminersPrimary: Truhe, J. V.Assistant: Paschall, Mark H. Attorney, Agent or FirmInternational ClassB23K 027/00Foreign Application Priority Data1975-07-08 UKAbstractTo ascertain the beam intensity threshold at which the intensity of a laser beam will just be sufficient to engrave a workpiece, the value of a beam-intensity control signal is progressively increased or decreased until engraving starts or stops, this being sensed by detecting the initiation or termination of ionization which occurs when the beam intensity is above the threshold value adjacent a part of the workpiece which is being subjected to the action of the laser beam.Other References
Field of SearchWith probe, prod or terminals | |
