In the next month, Pang Xuelin walked all the way from the East Coast of the United States to the West Coast of the United States.

Every time I go to a university, it has set off a lot of waves.

Not only those students and teachers in the Department of Mathematics wanted to meet Pang Xuelin, but even students and teachers in other majors also wanted to see the demeanor of this self-taught genius mathematician who independently completed the work of proving Fermat's conjecture.

Especially after Pang Xuelin appeared on an Oprah talk show, his popularity in the United States has risen to a higher level.

People may not know what he is studying, but when it comes to China's genius mathematicians, the name of Pang Xuelin will definitely come to mind.

A month passed in a flash, Harvard, MIT, Stanford...... After leaving their mark on these top American universities one by one, Pang Xuelin's trip to the United States is finally coming to an end.

That night, Pang Xuelin and A Qing were packing their luggage to return to China in the room, when a knock on the door suddenly sounded.

"Please come in!"

Pang Xuelin said.

Soon, Geng Huan waved a document and pushed the door in: "Mr. Pang, this is the reply document from the National Patent Office of the United States, and I have found it through a friend." The sildenafil citrate you mentioned has not yet registered any relevant patents, and as for the other product, atorvastatin, there are only patents for compounds, and there are no synthesis process patents, use patents, crystal form patents, etc., as you mentioned......"

Pang Xuelin was slightly stunned, and took the document directly from Geng Huan's hand and looked at it.

On the one hand, Pang Xuelin needs to make his voice heard in the international academic community and improve his status in the academic community.

On the other hand, there is a more important job to look at the various industries that can really make money in the future.

For Pang Xuelin, his current political status and academic status are enough, and if he wants to complete the tasks assigned by the system, the rest is the problem of funding.

But money is the biggest problem.

Not to mention himself, in this era, the country is also short of money.

Therefore, if Pang Xuelin wants to improve the level of education in poor areas of China on a large scale, he must have a stable source of money at hand.

Pang Xuelin has considered many ways to make money, such as the Internet, finance, stock market, and so on.

But Pang Xuelin found that the feasibility was not high.

Needless to say, if you want to engage in the Internet in this era, you need to keep investing money instead of making money.

It will be at least a dozen years before the Internet industry really starts to make a lot of money.

Not to mention the stock market, Pang Xuelin only knows the big trends, such as the 97 Asian financial crisis, the US stock market after the 911 incident, oil futures during the Iraq war in 2003, and the financial crisis in 2008.

The timing is not right.

Therefore, in the end, Pang Xuelin set his sights on the field of medicine.

Sildenafil citrate, atorvastatin, these are two products carefully selected by Pang Xuelin.

Needless to say, sildenafil, everyone on earth knows it.

It is with this product that Pfizer has leapt from an ordinary pharmaceutical company producing antibiotics to the largest pharmaceutical giant in North America and even the world.

Since sildenafil was launched in 1998, in the following ten years, the total sales of sildenafil exceeded 100 billion US dollars, and the profit was as high as tens of billions.

The patent dispute about sildenafil has been reported many times on the Internet, and Pang Xuelin has also seen it, and he has the impression that although Pfizer is still researching sildenafil, it did not register a patent until the mid-nineties.

As for another drug, atorvastatin, it has a much better known brand name, Lipitor.

This drug is a product of the American pharmaceutical giant Warner Lambert, which is mainly used for patients with hypercholesterolemia, coronary heart disease or coronary heart disease and other critical conditions with hypercholesterolemia or mixed dyslipidemia, and has excellent efficacy.

After Pfizer acquired Warner Lambert for 2,000 years, it turned Lipitor into a super explosive product with annual sales exceeding 10 billion US dollars, which became another important growth point for Pfizer's profits.

The only regret is that atorvastatin's compound patent has been registered, but the synthesis process patent, use patent, and crystal form patent are still blank.

If you can register various patents for sildenafil citrate and atorvastatin in advance before Pfizer, even if you don't produce them in the future, you can gnaw a big piece from the hands of international pharmaceutical giants.

Of course, at the moment, Pang Xuelin can only think about it, after all, whether it is sildenafil citrate or atorvastatin, he does not have a complete preparation method and process.

In addition, the lawyer's fees for registering a global patent require a large amount of money, which needs to be solved after he returns to China.

Early the next morning, Pang Xuelin and his entourage appeared at Los Angeles International Airport and joined Dewarwick, who was transferring from Philadelphia.

After waiting for more than three hours, the group finally flew on a flight to China.

Nothing to say all the way.

After more than ten hours of flight, everyone arrived at the Capital International Airport smoothly.

After getting off the plane, as soon as everyone walked out of the VIP channel, they saw Liu Changzheng, Xu Jingyuan, Li Zhiguo and others standing at the door of the VIP channel, looking at them with a smile.

"Teacher Pang, hard work!"

Liu Changzheng took the lead and shook hands with Pang Xuelin.

During this time, Pang Xuelin's performance in the United States has long been spread to China.

The theory of Ponzi geometry presented at the Princeton Symposium also caused a sensation in the domestic mathematical community.

Everyone understands that this young man has become the hottest mathematician in the international mathematical community.

For him, the Fields Medal is as simple as finding something.

Therefore, whether it is Liu Changzheng or Xu Jingyuan, there has been a subtle change in their attitude towards Pang Xuelin.

Pang Xuelin and Liu Changzheng shook hands one by one.

To Pang Xuelin's surprise, one of the people who greeted him was actually Luan Jingtong, president of Tsinghua University.

Seeing Pang Xuelin and Dehua Weiteng who was following him, Luan Jingtong almost smiled crookedly.

When Pang Xuelin caused a storm abroad before, several domestic units had almost broken their heads in order to compete for Pang Xuelin.

Luan Jingtong never expected that Pang Xuelin would take the initiative to ask to work at Tsinghua University, and by the way, he also kidnapped a Fields Medal winner.

A quasi-Filipino Award boss, plus a Filipino Award boss, has made achievements in mathematics and physics, two weak disciplines of Tsinghua University, how can this not make Luan Jingtong happy.

After a few words of greeting, everyone got into the car directly.

Pang Xue was pulled into a Hongqi car by Liu Changzheng, and several other people got directly on the bus.

"Teacher Pang, the chief wants to see you."

As soon as he got in the car, the first sentence Liu Changzheng said surprised Pang Xuelin.