Wing v. Anthony (1882)
Imagine the photography scene in the mid-1800s—bulky cameras, daguerreotype plates, and long exposures where no one dared to blink. Into this world stepped Albert S. Southworth, who came up with a sliding plate system to speed things up. Great idea, right? But when he tried to broaden that idea years later through a re-issued patent, the Supreme Court had something to say about where innovation ends and nature—or common sense—begins. That’s the story of Wing v. Anthony (1882).
Setting the Stage: What Was at Stake
Southworth first patented a sliding plate mechanism in 1855. The idea was simple: instead of replacing plates one by one, you could slide a plate (or several smaller plates) across the camera’s field to capture more images quickly. Practical, efficient, and an improvement on what photographers were already doing.
Fast forward to 1860, Southworth wanted more. He refiled for a patent, not just on the sliding plate itself, but on the broader concept of moving either the plate, the lens, or even the subject to accomplish the same result. That re-issue expanded the scope from a single clever tool to basically claiming any method that rearranged camera components to get more pictures in less time.
This image was created with Leonardo.ai.
This image was created with Leonardo.ai.
When Anthony and his camp were accused of infringing, they didn’t just argue, “We didn’t copy.” Instead, they went straight for the jugular: this re-issued patent was invalid to begin with.
The Legal Questions
The Supreme Court had to tackle two big issues. First was whether Southworth’s re-issued patent was invalid for lack of novelty. Second was whether the subject matter could be patented.
The Court’s Take: Novel but Not Patentable
Here’s where things get interesting. The Court actually said the re-issue was novel—it expanded on the earlier patent and wasn’t identical to known devices. But novelty isn’t the whole story. To get a patent, the invention also has to fall within the categories Congress has said are patentable: machines, processes, compositions of matter, and the like.
The problem? Southworth’s re-issued claim was so broad that it tried to cover every possible way of moving a plate, a lens, or even the subject itself to capture multiple images. That, the Court said, was essentially an attempt to patent a law of nature—the simple principle that moving parts of a camera changes what the lens sees. And laws of nature, like gravity or the fact that moving a camera changes perspective, are off-limits.
The Court leaned on Heald v. Rice (1881), which held that you can’t patent a process after already patenting the machine that uses it. Once the underlying principle is known, you can’t come back and claim ownership of the natural law itself.
So, even though Southworth’s re-issue was different from the original, it wasn’t patentable. The Court voided the patent and dismissed the case.
This image was created with Leonardo.ai.
This image was created with Leonardo.ai.
Why This Matters
Wing v. Anthony teaches us that patents have limits. Innovation gets rewarded, but you can’t stretch a good idea into a monopoly over nature’s rules. Just because you invent a sliding plate doesn’t mean you get to claim every conceivable way someone might move a camera component to achieve a similar result.
That balance—between protecting inventors and preventing overreach—is still central to patent law today. Modern cases under 35 U.S.C. §101 wrestle with the same questions: what’s a true invention, and what’s just a natural law or abstract idea dressed up in new words?
👉 Takeaway: Patents protect creativity, but they stop where nature and common knowledge begin. Southworth’s sliding plate was clever. His attempt to monopolize all methods of moving camera parts? Not so much.
Quick Glossary
-Law of Nature: A basic principle of science or nature (like gravity, light refraction, Newton’s laws, etc.) that cannot be patented.
-Novelty: A requirement for patents to have something new or different from prior art.
-Patentable: The ability to meet the requirements of a patent specifically the right type of subject matter (an idea), that is useful, novel, non-obvious, and properly disclosed so it can be reproduced by others.
-Prior Art: Existing knowledge, inventions, or other subject matter that is used to determine of something is patentable.
-Subject Matter: The type of invention, process, manufacture, or concrete ideas that can be patented; excluding things like laws of nature, abstract ideas, and other similar concepts.
References (and Why They Matter)
- Wing v. Anthony, 106 U.S. 142 (1882)
This case, where the Court invalidated the re-issued patent and set some limits on how far patent claims can go. - Heald v. Rice, 104 U.S. 737 (1881)
One of the cases the Court leaned on here, reinforcing the idea that you can’t take a machine patent and stretch it into a process patent after the fact. - U.S. Patent Act of 1836
The governing law at the time. It laid out how patents worked in the 19th century. Shows a glimpse of how long the novelty vs. patentability debate has been around. - 35 U.S.C. §101 (modern rule)
Today’s law on patentable subject matter. It still excludes laws of nature, abstract ideas, and natural phenomena — the same logic the Court used back in 1882.