Maintenance fees coming due
Sinopec Engineering Incorporation
3 maintenance fees come due in the 12 months from Nov 15, 2026, the next on May 3, 2027. Unpaid by Nov 3, 2027, that one lapses early.
A maintenance fee does not end a patent on its due date. It falls due at 3.5, 7.5
and 11.5 years from grant, and the patent lapses only if the fee is still unpaid at the end of the
six month grace period that follows.
| Patent | Title | Holder | Status | Fee due | Lapses if unpaid | Expires | Confidence |
|---|---|---|---|---|---|---|---|
| US 9,174,183 | Fluidized Bed Polymerization Reactor and Process for Preparing Polymer In force Fee due May 3, 2027 Lapses if unpaid Nov 3, 2027 · High confidence | China Petroleum & Chemical Corporation, Zhejiang University and Sinopec Engineering Incorporation | In force | May 3, 2027 | Nov 3, 2027 | High confidence | |
| US 9,205,400 | Ethylene Cracking Furnace In force Fee due Jun 8, 2027 Lapses if unpaid Dec 8, 2027 · High confidence | China Petroleum & Chemical Corporation and Sinopec Engineering Incorporation | In force | Jun 8, 2027 | Dec 8, 2027 | High confidence | |
| US 11,946,002 | Method and Device for Treating Oil Gas In force Fee due Oct 2, 2027 Lapses if unpaid Apr 3, 2028 · High confidence | Sinopec Engineering Incorporation and Sinopec Engineering (Group) Co., Ltd. | In force | Oct 2, 2027 | Apr 3, 2028 | High confidence |
3 of 3 patents shown. Soonest fee due date first, then patent number.
Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.