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.
US patents with a filing date before June 8, 1995 provide protection for up to seventeen years counting from the date of grant (the date given with reference numeral 45), or 20 years from the filing date, whichever expires later. However, the patent holder is required to pay maintenance fees to keep his patent valid. In most European countries, these fees are yearly. The USA requires maintenance fees to be paid at 3.5 years, 7.5 years, and 11.5 years after issuance. If the holder does not pay a maintenance fee, the patent becomes abandoned.