PatentCounter.java

package com.joehxblog;

import java.io.FileWriter;
import java.io.IOException;
import java.util.function.Consumer;

import org.jsoup.HttpStatusException;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.select.Elements;

public class PatentCounter {
    public static final String URL = "https://patents.google.com/patent/US";

    public static void main(final String... args) {

        try (FileWriter writer = new FileWriter("patents.csv")) {
            writer.write("count,year,month,day" + System.lineSeparator());

            final int start = 1;
            final int end = 10_709_051;
            final int increment = 97_355;

            // Got to use this type of for loop rather than an
            // IntStream due to a possible thrown exception.
            for (int i = start; i <= end; i += increment) {
                try {
                    final Document doc = Jsoup.connect(URL + i).get();

                    // <time itemprop="publicationDate" datetime="1836-07-13">1836-07-13</time>
                    final Elements granted = doc.getElementsByAttributeValue("itemprop", "publicationDate");

                    write(t -> {
                        try {
                            writer.write(t);
                        } catch (final IOException e) {
                            e.printStackTrace();
                        }
                    }, i, granted);

                    write(System.out::print, i, granted);
                } catch (final HttpStatusException e) {
                    System.out.println("Patent " + i + " not found.");
                }
            }
        } catch (final IOException e) {
            e.printStackTrace();
        }
    }

    public static void write(final Consumer<String> writer, final int i, final Elements granted) {
        writer.accept(i + ",");
        writer.accept(granted.first().text().replace('-', ','));
        writer.accept(System.lineSeparator());
    }
}

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" 
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
                             https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.joehxblog</groupId>
  <artifactId>patent.counter</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>Patent Counter</name>
  <dependencies>
    <dependency>
        <groupId>org.jsoup</groupId>
        <artifactId>jsoup</artifactId>
        <version>1.13.1</version>
    </dependency>
  </dependencies>
</project>

This code was used for my blog post Is Technology Accelerating? An Analysis of US Patent Records.