H. Tracy Hall Patent Index

All patents are available for download in pdf format.*

1. Diamond Abrasive Wheel: U.S. Patent No. 2,728,651, Dec. 27, 1955.
2. High Pressure Press (The Tetrahedral Anvil Press): U.S. Patent No. 2,918,699, Dec. 29, 1959.
3. High Pressure High Temperature Apparatus: U.S. Patent No. 2,941,242, June 21, 1960.
4. High Pressure High Temperature Apparatus (The Belt): U.S. Patent No. 2,941,248, June 21, 1960.
5. Reaction Vessel: U.S. Patent No. 2,941,250, June 21, 1960.
6. Reaction Vessel: U.S. Patent No. 2,944,289, June 21, 1960.
7. Diamond Synthesis (First Occurrence): U.S. Patent No. 2,947,608, Aug. 2, 1960.
8. Method of Making Diamond: U.S. Patent No. 2,947,610, Aug. 2, 1960.
9. Method of Making High Compressive Strength Silicon Carbide: U.S. Patent No. 3,158,442, Nov. 24, 1964.
10. High Pressure Press: U.S. Patent No. 3,159,876, Dec. 8 1964.
11. High Pressure High Temperature X-Ray Diffraction Apparatus: U.S. Patent No. 3,249,753, May 3, 1966.
12. Guide Means for High Pressure Press (Anvil Guides): U.S. Patent No. 3,182,353, May 11, 1965.
13. Diamond-Nondiamond Carbon Polycrystalline Composites (Polycrystalline Diamond): U.S. Patent No. 3,816,085, June 11, 1974.
14. High Pressure-High Temperature X-Ray Diffraction Apparatus: U.S. Patent No. 3,249,753, May 3, 1966.
15. Multianvil Press (Cubic Press): U.S. Patent No. 3,440,687, April 29, 1969.
16. Method of Making a Unitary Polycrystalline Diamond Composite: U.S. Patent No. 3,829,544, Aug. 13, 1974.
17. Polycrystalline Diamond Composites: U.S. Patent No. 3,913,280, Oct. 21, 1975.
18. High Thermal Conductivity Substrate: U.S. Patent No. 4,104,344, Aug. 1, 1978.
19. Guided High Pressure Presses: U.S. Patent No. 5,744,170, Apr. 28, 1998.