Though the United States Patent and Trademark Office lets you trademark a scent, few have taken them up on the offer. Millions of conventional trademarks (logos, slogans, etc.) have been registered, but the government's filings on their olfactory counterparts could barely fill a three-ring binder—by our count, there are less than a dozen active trademarked scents.

The first trademarked smell in the U.S. was a plumeria blossom-scented embroidery thread, and it was issued in 1990. California company OSEWEZ (pronounced "Oh Sew Easy") was able to obtain the distinction after successfully arguing for it in front of the Trademark Trial and Appeal Board, opening the door to future scent trademarks. (OSEWEZ's plumeria thread trademark has since lapsed.)

That such a small number of these trademarks have been issued is due in part to the somewhat surprising reasoning behind what smells qualify. According to The Wall Street Journal, "In the U.S., you have to show that a fragrance serves no important practical function other than to help identify and distinguish a brand." This means that a product whose purpose is only smell-related—like perfume or air fresheners—cannot receive the protection of a scent trademark.

Also, trademark applications have to be smelled by a government examiner, so samples must be provided. As a U.S. trademark official told The Wall Street Journal, "If an examiner’s nose isn’t working, the attorney would have to find a supervisor to do the sniffing."

"The difficulty in registering a scent mark on the Principal Register appears to have deterred applicants from filing scent mark applications in the United States," explains the International Trademark Association.

Other countries are stricter still. There are no current scent trademarks registered with the EU. Australia has granted only one (for a brand of eucalyptus-scented golf tee), and the UK has two registered smell trademarks, both successfully applied for in 1994: dart feathers that smell like bitter beer, and “a floral fragrance/scent reminiscent of roses as applied to tyres” for road vehicles.

Our search of the U.S. Patent and Trademark Office uncovered only 10 active registered scent trademarks. One application for an orange-scented chemical used in fracking is still open and received some press attention earlier this year, but the company responsible for it seems to be letting the request lapse.

The following scents don't necessarily smell better than normal aromas—they just have better lawyers.

1. "FLOWERY MUSK SCENT" IN VERIZON STORES.

Getty Images

Reg. 4618936

Verizon plans to pump this trademarked scent into their larger, "marquee" retail stores. Their application argues that the smell would help distinguish these locations from "other communications and consumer electronics retailers in an increasingly crowded field." It became an official trademark on October 7, 2014.

2. BUBBLE GUM SCENT FOR SANDALS.

Reg. 4754435

Brazilian footwear company Grendene successfully trademarked their line of bubble gum-scented jelly sandals in June, 2015. To do this, they sent the Commissioner for Trademarks an example for consideration, along with the attached note: “The applicant … respectfully submits the enclosed sandal as evidence.”

3. PIÑA COLADA SCENT TO COAT UKULELES.

Reg. 4144511

The Eddy Finn Ukulele Co. fought for the right to trademark the piña colada smell that they apply to one of their ukulele models. They won the trademark, but wound up facing problems with the product itself. According to The Wall Street Journal, "Ukuleles shipped overseas lost their scent during the voyage … so by the time their international customers plucked them, they just smelled like ukuleles."

4. THE COCONUT SMELL THAT FILLS FLIP FLOP STORES.

Reg. 4113191

Footwear chain Flip Flop Shops received a trademark for the coconut aroma they pump into their retail locations. Their application included pages and pages of press releases arguing that the scent was a key part of their brand. "Approaching from 15 feet away," one example reads, "coconut suntan oil scent and active lifestyle inspired music begins to tickle the senses and excite the toes of likely customers."

Flip Flop Shops co-owner Darin Kraetsch is a fan of many sensory experiences, it seems. "Believe me, if they had an edible flip-flop, we’d have it," he said in an interview (also included in their trademark application).

5. ROSE-SCENTED MARKETING PRODUCTS.

U.S. Patent and Trademark Office

Reg. 3849102

This trademark is extra unique in that it was issued to an individual and not a company. The applicant, a Bulgarian citizen, and his lawyer successfully argued for the right to trademark rose-scented marketing materials by astutely playing to the U.S. Patent and Trademark Office's guidelines for a scent's non-functionality:

“This odor may be impregnated into promotional items such as hand wipes or soaps, or may be created by the application of geraniol to the packaging or advertising associated with promotional items which may have no odor, or may have a different odor, of their own.”

For his example, he sent in a rose-scented hand wipe packaged inside a jewelry store advertisement (pictured above).

6. "MINTY" PAIN-RELIEF PATCHES.

Reg. 3589348

Hisamitsu Pharmaceutical Co., a Japanese company, trademarked the "minty" scent of their pain-relief patches, a smell produced by a "mixture of highly concentrated methyl salicylate (10wt%) and menthol (3wt%)."

7. STRAWBERRY TOOTHBRUSHES.

Reg. 3332910

The application lists these as "toothbrushes impregnated with the scent of strawberries," and Lactona, the company which makes them, formally obtained the trademark in 2007.

8, 9, 10. STRAWBERRY, CHERRY, AND GRAPE LUBRICANTS FOR COMBUSTION ENGINES.

Reg. 2568512, 2596156, 2463044

These lubricants, marketed today as "Fuel Fragrances" by Manhattan Oil, make your exhaust redolent. There are nearly 20 varieties, but only three smells are on record as being trademarked: "Super Charged Strawberry," "Cherry Bomb," and "Groovy Grape." First filed in 1995, these applications are the oldest scent trademarks that are still active today.