Keystone Engineering Inc.
Records under this name other than the patents Keystone Engineering Inc. holds now: patents now held by others, patents whose terms have ended, and its applications, pending or abandoned. None of them is counted in the 2 patents it holds.
Back to Keystone Engineering Inc.
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 8,534,489 | Demisable Fuel Supply System Lapsed on the fee record Ended Sep 17, 2025 · High confidence | Lapsed on the fee record | Ended Sep 17, 2025 | High confidence |
| US 8,511,504 | Demisable Fuel Supply System Lapsed on the fee record Ended Aug 20, 2025 · High confidence | Lapsed on the fee record | Ended Aug 20, 2025 | High confidence |
| US 7,198,453 | Offshore structure support and foundation for use with a wind turbine and an associated method of assembly Term ended Term ended Mar 16, 2025 · From the USPTO record | Term ended | Term ended Mar 16, 2025 | From the USPTO record |
| US 10,611,503 | Center of Mass Control of Liquid Tanks for Spacecraft Use Lapsed on the fee record Ended Apr 7, 2024 · High confidence | Lapsed on the fee record | Ended Apr 7, 2024 | High confidence |
| US 10,479,532 | Stress Relieved Welds in Positive Expulsion Fuel Tanks with Rolling Metal Diaphragms Lapsed on the fee record Ended Nov 19, 2023 · High confidence | Lapsed on the fee record | Ended Nov 19, 2023 | High confidence |
| US 10,139,047 | Stress Relieved Welds in Positive Expulsion Fuel Tanks with Elastomeric Diaphragm Lapsed on the fee record Ended Nov 27, 2022 · High confidence | Lapsed on the fee record | Ended Nov 27, 2022 | High confidence |
| US 10,088,103 | Method of Fabricating Space Satellite Tank Components Utilizing Additive Manufacturing and Spin Forming Lapsed on the fee record Ended Oct 2, 2022 · High confidence | Lapsed on the fee record | Ended Oct 2, 2022 | High confidence |
| US 6,783,305 | Offshore structure support Term ended Term ended Jun 25, 2022 · From the USPTO record | Term ended | Term ended Jun 25, 2022 | From the USPTO record |
| US 7,134,809 | Offshores structure support Term ended Term ended May 20, 2022 · From the USPTO record | Term ended | Term ended May 20, 2022 | From the USPTO record |
| US 7,942,611 | Offshore structure support Term ended Term ended May 20, 2022 · From the USPTO record | Term ended | Term ended May 20, 2022 | From the USPTO record |