Patents Issued

       1.    9,604,339 Vacuum-Grooved Membrane Wafer Polishing Workholder
       2.    9,233,452 Vacuum-Grooved Membrane Abrasive Polishing Wafer Workholder
       3.    9,199,354 Flexible Diaphragm Post-Type Floating and Rigid Abrading Workholder
       4.    9,039,488 Pin Driven Flexible Chamber Abrading Workholder
       5.    9,011,207 Flexible Diaphragm Combination Floating and Rigid Abrading Workholder
       6.    8,998,678 Spider Arm Driven Flexible Chamber Abrading Workholder
       7.    8,998,677 Bellows Driven Floatation-Type Abrading Workholder
       8.    8,845,394 Bellows Driven Air Floatation Abrading Workholder
       9.    8,758,088 Floating Abrading Platen Configuration
     10.    8,740,668 Three-Point Spindle-Supported Floating Abrasive Platen
     11.    8,696,405 Pivot-Balanced Floating Platen Lapping Machine
     12.    8,647,172 Wafer Pads for Fixed-Spindle Floating-Platen Lapping
     13.    8,647,171 Fixed-Spindle Floating-Platen Workpiece Loader Apparatus
     14.    8,647,170 Laser Alignment Apparatus for Rotary Spindles
     15.    8,641,476 Coplanar Alignment Apparatus for Rotary Spindles
     16.    8,602,842 Three-Point Fixed-Spindle Floating-Platen Abrasive System
     17.    8,545,583 Method of Forming A Flexible Abrasive Sheet Article
     18.    8,500,515 Fixed-Spindle and Floating-Platen Abrasive System Using Spherical Mounts
     19.    8,430,717 Dynamic Action Abrasive Lapping Workholder
     20.    8,337,280 High Speed Platen Abrading Wire-Driven Rotary Workholder
     21.    8,328,600 Workpiece Spindles Supported Floating Abrasive Platen
     22.    8,256,091 Equal Sized Spherical Beads
     23.    8,062,098 High Speed Flat Lapping Platen
     24.    7,632,434 Abrasive Agglomerate Coated Raised Island Articles
     25.    7,520,800 Raised Island Abrasive, Lapping Apparatus and Method of Use
     26.    6,769,969 Raised Island Abrasive, Method of Use and Lapping Apparatus
     27.    6,752,700 Raised Island Abrasive and Process of Manufacture
     28.    6,607,157 Air Bearing System with An Air Cylinder Web Dancer System or Idler Rolls
     29.    6,149,506 Lapping Apparatus and Method for High Speed Lapping with A Rotatable Abrasive Platen
     30.    6,120,352 Lapping Apparatus and Lapping Method Using Abrasive Sheets
     31.    6,102,777 Lapping Apparatus and Method for High Speed Lapping with A Rotatable Abrasive Platen
     32.    6,048,254 Lapping Apparatus and Process with Annular Abrasive Area
     33.    5,993,298 Lapping Apparatus and Process with Controlled Liquid Flow Across the Lapping Surface
     34.    5,967,882 Lapping Apparatus and Process with Two Opposed Lapping Platens
     35.    5,910,041 Lapping Apparatus and Process with Raised Edge on Platen

Pending

       1.    Abrasive Coated Disk Islands Using Magnetic Font Sheet
       2.    Spherical Action Pressure Chamber Abrading Workholder

 

Patent Quality

The quality and significance of the issued patents is related to how many

times they are cited as a reference in other patents. These patents have

been cited 900 times, a clear demonstration of their importance.

​

Proprietary Technology

In addition to the many patents that are in the Keltech Patent Portfolio, a

number of the manufacturing processes developed are proprietary or

Trade Secret. These proprietary processes or techniques are critical for

the production of the large equal-sized abrasive particle filled beads and

how they are coated on the disc islands. Because of this, the patents

alone are not sufficient to truly utilize this abrasive system.  This protects

Keltech so that no outside company can copy this system or easily find

an alternative to it.