It can be abbreviated MNTAIN, MNTN, MOUNTIN, MT, MTIN, MTN. However, the most common abbreviation used is MT. For the source and more detailed information concerning this sub â¦ ject, click on the related links section indicated below.ne common abbreviation is ca.. Another way is the equals sign = with a squiggle over it-- like an S on its side. ## The word about is abbreviated as: abt.
For applications filed before June 8, 1995 and for patents that were still in force on June 8, 1995, the patent term is either 17 years from the issue date or 20 years from the filing date of the earliest U.S. or international (PCT) application to which priority is claimed (excluding provisional applications), the longer term applying.
1 To stay in force for the entire 20 year term, utility patent owners must pay three maintenance fees. 2  If one of those fees is not paid then the patent will be seen as expired and no longer enforceable. 3  Most patentees do not pay all three fees-thus most patents expire before completion of the 20 year term.