Prior art — US Patent 11447993B1

To identify the most relevant prior art for US patent 11447993B1 and determine which claims they potentially anticipate, I need to consult the citations within the patent itself. The provided patent text includes a "Citations" section. I will analyze each of these listed prior art references.

Here's an analysis of the cited prior art for US Patent 11447993B1, focusing on relevance and potential anticipation under 35 U.S.C. § 102:

Patent Citations

US2794665A - Night latch
- Full Citation: US2794665A
- Publication Date: 1957-06-04
- Brief Description: This patent describes a night latch mechanism. While it deals with door security, it appears to be a traditional latching mechanism rather than a hinge-mounted, gravity-biased swing plate for forced entry prevention as described in US11447993B1.
- Potential Anticipation: Less likely to anticipate the specific structural and functional features of claims 1 and 10 of US11447993B1, particularly regarding the hinge pin assembly, receiver ears/bays, declining slide surface, and gravity-biased locking swing plate.
US3431591A - Selectively releasable engageable separable-leaf hinge
- Full Citation: US3431591A
- Publication Date: 1969-03-11
- Brief Description: This patent describes a hinge with separable leaves that can be selectively engaged and released. This is relevant in the broad sense of hinge mechanisms.
- Potential Anticipation: Could potentially be considered for elements of the hinge pin assembly or general concepts of hinge construction, but less likely to anticipate the specific security features, the gravity-biased locking mechanism, or the detailed interaction between the mounting plate and locking swing plate described in claims 1 and 10.
US3810667A - Latch
- Full Citation: US3810667A
- Publication Date: 1974-05-14
- Brief Description: This patent describes a latch. Similar to US2794665A, it focuses on a general latching mechanism for doors, which is a different approach to security than the device in US11447993B1.
- Potential Anticipation: Unlikely to anticipate the core elements of US11447993B1, which revolve around a swing plate, mounting plate, and gravity-driven locking in conjunction with a hinge-like structure.
US6353967B1 - Ninety-degree door hinge
- Full Citation: US6353967B1
- Publication Date: 2002-03-12
- Brief Description: This patent describes a door hinge designed for ninety-degree movement. The concept of a hinge operating at a specific angle could be broadly relevant to the angular positions described in US11447993B1.
- Potential Anticipation: Could be relevant to the general idea of controlling door swing angles. However, it's less likely to anticipate the specific anti-forced entry features, the receiver wall with varying height, or the gravity-actuated locking mechanism of claims 1 and 10.
US20050046201A1 - Portable security locks
- Full Citation: US20050046201A1
- Publication Date: 2005-03-03
- Brief Description: This patent describes portable security locks. Portable devices are generally different from the permanently mounted system of US11447993B1.
- Potential Anticipation: Less likely to anticipate the permanent installation and the specific mechanical interaction between the mounting plate and locking swing plate in US11447993B1.
US20090217485A1 - Hinges
- Full Citation: US20090217485A1
- Publication Date: 2009-09-03
- Brief Description: This patent describes hinges in general. Without more specific details, it's difficult to assess its direct relevance to the unique locking mechanism of US11447993B1.
- Potential Anticipation: Could potentially overlap with general hinge components if claims 1 and 10 were interpreted very broadly, but unlikely to anticipate the specific security and locking features.
US20100251520A1 - Loose-Pin Hinge and Hinge Pin with Integrated Stop
- Full Citation: US20100251520A1
- Publication Date: 2010-10-07
- Brief Description: This patent describes a loose-pin hinge and a hinge pin with an integrated stop. The "integrated stop" feature has some conceptual overlap with the idea of limiting door movement, which is a function of US11447993B1.
- Potential Anticipation: This could be more relevant to certain aspects of the hinge pin assembly and the concept of preventing movement. However, claims 1 and 10 of US11447993B1 go beyond a simple stop, incorporating a gravity-biased locking swing plate with specific interaction with the mounting plate's varied-height receiver wall and locking channel.
US20110156409A1 - Door guard
- Full Citation: US20110156409A1
- Publication Date: 2011-06-30
- Brief Description: This patent describes a door guard. Door guards often provide supplemental security, which is the general aim of US11447993B1.
- Potential Anticipation: The general concept of a "door guard" is broad. Without knowing the specific mechanism, it's hard to assess direct anticipation. However, if it does not involve the specific hinge-mounted, gravity-biased, swing-plate locking mechanism, it's unlikely to anticipate claims 1 and 10.
US8534721B1 - Closure restraint system
- Full Citation: US8534721B1
- Publication Date: 2013-09-17
- Brief Description: This patent describes a closure restraint system. This title suggests a system for preventing a door or closure from opening fully or at all.
- Potential Anticipation: This could be highly relevant, depending on its specific mechanism. If this system includes a plate or similar element that interacts with the door and door frame, and particularly if it employs a gravity-actuated or pivotable locking element, it could potentially anticipate aspects of claims 1 and 10, especially the "major blocking surface" and its function. Further analysis of the detailed description of US8534721B1 would be needed.
US20160298361A1 - Strike Plate Lock
- Full Citation: US20160298361A1
- Publication Date: 2016-10-13
- Brief Description: This patent describes a strike plate lock, which typically reinforces the door jamb around the latch.
- Potential Anticipation: While it aims to enhance door security, a strike plate lock focuses on the latching mechanism, not the hinge-side, gravity-biased swing plate approach of US11447993B1. Thus, it's unlikely to anticipate claims 1 and 10.

Family Cites Families

US4322100A - Abutment swivel doorstop
- Full Citation: US4322100A
- Publication Date: 1982-03-30
- Brief Description: This patent describes a doorstop that can swivel into an abutment position. This shares the broad idea of physically blocking door movement.
- Potential Anticipation: The "abutment swivel doorstop" could be considered for the general concept of a physical obstruction to door movement. However, the specific mechanical implementation of US11447993B1, with its mounting plate, receiver ears/bays, declining slide surface, and gravity-biased locking swing plate, appears to be more complex and distinct from a simple swivel doorstop.
GB2098271A - Locking device
- Full Citation: GB2098271A
- Publication Date: 1982-11-17
- Brief Description: This patent describes a locking device. Without more specific details from the patent itself, it's a very broad category.
- Potential Anticipation: Difficult to assess without further details, but generally broad "locking devices" are less likely to anticipate the specific structural and functional combination of elements in US11447993B1.
US20180128025A1 - Doorstop Apparatus
- Full Citation: US20180128025A1
- Publication Date: 2018-05-10
- Brief Description: This patent describes a doorstop apparatus. Similar to US4322100A, it involves stopping a door.
- Potential Anticipation: The term "doorstop apparatus" is broad. Unless it features the specific hinge-mounted, gravity-biased locking swing plate with the detailed receiver wall and locking channel as described in claims 1 and 10, it is unlikely to anticipate.
KR101983842B1 - Safety magnet hinge for door
- Full Citation: KR101983842B1
- Publication Date: 2019-05-29
- Brief Description: This Korean patent describes a safety magnet hinge for a door. The use of a magnet for safety in a hinge could be broadly related to securing a door.
- Potential Anticipation: While a "safety magnet hinge" is relevant to door security through the hinge, the mechanism of magnetic engagement is different from the gravity-biased mechanical interlock detailed in US11447993B1. Thus, it's unlikely to anticipate claims 1 and 10, particularly the mechanical interaction of the receiver wall, declining slide surface, and locking channel with the swing plate.

Most Relevant Prior Art

Based on a preliminary review, US8534721B1 (Closure restraint system) appears to be the most relevant among the cited prior art due to its general title suggesting a system to restrain a closure, which aligns with the anti-forced entry purpose of US11447993B1. However, a detailed analysis of its claims and figures would be necessary to determine the extent of its anticipation of claims 1 and 10 of US11447993B1. Specifically, one would need to examine if US8534721B1 discloses:

A mounting plate secured to the door jamb (second jamb interior surface).
A hinge pin assembly supporting a locking swing plate.
A locking swing plate configured for both pivotal and vertical translation movement.
A mounting plate with first receiver ears and bays having a receiver wall with varying height, including a major rest, a declining slide surface, and a locking channel.
A gravity-biased mechanism that moves the locking swing plate to a lowermost locked position where it abuts the door interior surface.
Specific features of the locking channel (major vertical wall, minor lower wall) that prevent pivoting movement when locked.

Other patents, such as US20100251520A1 (Loose-Pin Hinge and Hinge Pin with Integrated Stop), may also have some relevance regarding elements of the hinge or stopping mechanisms, but they seem less comprehensive in addressing the specific combination of features found in US11447993B1.