US 11447993B1

Here's a concise summary of US Patent 11447993B1:

Patent Number: US11447993B1

Title: Door security device

Assignee: Notrox LLC

Inventors: John Reger

Filing Date: 2021-11-22

Issue Date (Publication Date): 2022-09-20

Abstract: A door security device for an in-swing door includes a mounting plate secured to the door jamb adjacent the door outside edge, a hinge pin assembly supported by the mounting plate proximate the door outside edge, a locking swing plate secured to the hinge pin assembly for pivotal movement between unlocked and locked angular positions in relation to the hinge pin vertical axis, the locking swing plate biased by force of gravity to a lowermost position, and the mounting plate having a first receiver wall defining the lowermost position of the locking swing plate in the locked position perpendicular to a first rear surface of the mounting plate and defining the uppermost position of the locking swing plate in the unlocked position away from the locked angular position.

Plain-Language Overview of Independent Claims:

• Claim 1 (Independent): This claim describes a door locking device for an in-swing door. The device includes a mounting plate attached to the door jamb (specifically, the second jamb interior surface) using fasteners. The mounting plate has a set of "first receiver ears" and "first receiver bays" along a hinge pin vertical axis, which is outside the door's swing path. These bays are designed to mate with "second receiver ears" of a "locking swing plate." Each first receiver ear has a wall with a varying height, including a "first major rest" (maximum height) and a "locking channel bottom wall" (minimum height). There's also a "declining slide surface" that connects the major rest to the locking channel. The locking channel is an open slot in the receiver wall. The locking swing plate can pivot around the hinge pin and move vertically. When the locking swing plate is in a "locking angular position" and a "lowermost vertical position" (meaning it has dropped into the locking channel due to gravity), it is fixed in place. In this locked position, a "major blocking surface" on the swing plate abuts the door's interior surface, preventing the door from being forced open. The locking swing plate is designed to be biased downwards by gravity into this locked position and requires manual intervention to be raised to an "uppermost position" and unlocked.

• Claim 10 (Independent): Similar to Claim 1, this claim also describes a door locking device for an in-swing door. It specifies the mounting plate secured to the second jamb interior surface, and having a hinge pin vertical axis, first receiver ears, and first receiver bays. It also details the first receiver ears having a first receiver wall with an inner and outer surface and radii, and this wall varies in height. The claim explicitly defines a "first major rest" (maximum height), a "declining slide surface" with an "upper transition" and "lower transition," and a "locking channel" that has an "open slot." The locking channel also includes a "locking channel major vertical axis," a "locking channel major wall," a "locking channel top end," a "locking channel bottom wall" (minimum height), a "locking channel lower wall," and a "locking channel upper wall." The declining slide surface's lower transition introduces a "neck portion" of the locking swing plate's second receiver into the locking channel. Similar to Claim 1, the locking swing plate pivots and translates, is gravity-biased to a lowermost locked position where its major blocking surface abuts the door's interior surface, and is retained in this position unless manually raised. This claim provides more detailed structural specifications for the varying height of the first receiver wall and the components of the locking channel.

CAFC 2026 Dockets:
As of April 26, 2026, a search of the CAFC 2026 dockets did not return any specific litigation or cases directly referencing US Patent 11447993B1. The search results provided general CAFC case information and updates for 2026, but no direct hits for this patent number.