Prior art

To identify the most relevant prior art for US Patent 11447993, I will analyze the patent citations listed within the patent itself. The USPTO's Patent Public Search tool is an authoritative source for this information.

Here's an analysis of the cited prior art:

Prior Art Cited in US Patent 11447993

1. US2794665A - Night latch

• Full Citation: US2794665A, Sasse Reuben, "Night latch", published June 4, 1957, filed June 20, 1955.
• Brief Description: This patent describes a night latch mechanism.
• Potential Anticipation (35 U.S.C. § 102): While broadly related to door security, it's unlikely to anticipate the specific mechanical and gravity-biased locking features of US11447993, particularly the mounting plate with receiver ears/bays, declining slide surface, and locking channel that interacts with a vertically translating and pivoting locking swing plate. It may be cited for the general concept of a door locking mechanism.

2. US3431591A - Selectively releasable engageable separable-leaf hinge

• Full Citation: US3431591A, Ludwig & Co Inc A, "Selectively releasable engageable separable-leaf hinge", published March 11, 1969, filed June 5, 1967.
• Brief Description: This patent describes a hinge that can be selectively released or separated.
• Potential Anticipation (35 U.S.C. § 102): This reference might be relevant for its hinge mechanisms. However, US11447993 focuses on a security device that attaches to a door jamb and works with a hinge pin assembly, rather than a hinge itself. It's unlikely to anticipate the specific interaction of the locking swing plate, declining slide surface, and locking channel. It might be relevant to the broad concept of components interacting along a hinge pin axis.

3. US3810667A - Latch

• Full Citation: US3810667A, T Dugan, "Latch", published May 14, 1974, filed August 9, 1971.
• Brief Description: This patent describes a latch mechanism.
• Potential Anticipation (35 U.S.C. § 102): Similar to US2794665A, this patent is broadly related to door security. However, it's unlikely to anticipate the detailed structural and functional features of the gravity-biased, vertically translating, and pivoting locking swing plate and its interaction with the mounting plate's declining slide surface and locking channel as described in claims 1 and 10 of US11447993.

4. US6353967B1 - Ninety-degree door hinge

• Full Citation: US6353967B1, Francisco A. Escobar, "Ninety-degree door hinge", published March 12, 2002, filed September 2, 1998.
• Brief Description: This patent describes a door hinge designed to allow a door to open to a ninety-degree angle.
• Potential Anticipation (35 U.S.C. § 102): This patent might be relevant for hinges that control door opening angles. However, it's distinct from the security device of US11447993, which provides a secondary locking mechanism rather than a primary hinge function. The specific gravity-biased locking mechanism of US11447993 is not present.

5. US20050046201A1 - Portable security locks

• Full Citation: US20050046201A1, Thomas Patire, "Portable security locks", published March 3, 2005, filed August 28, 2003.
• Brief Description: This patent describes portable security locks.
• Potential Anticipation (35 U.S.C. § 102): This reference deals with portable security, which is a different category than the permanently installed device of US11447993. While both aim for door security, the specific structural components and gravity-activated locking mechanism of US11447993 are not found in the concept of a portable lock.

6. US20090217485A1 - Hinges

• Full Citation: US20090217485A1, Kenneth Springer, "Hinges", published September 3, 2009, filed July 17, 2004.
• Brief Description: This patent describes various hinge designs.
• Potential Anticipation (35 U.S.C. § 102): Similar to US3431591A and US6353967B1, this patent focuses on hinge constructions. It is unlikely to anticipate the unique combination of a mounting plate, locking swing plate, and gravity-biased locking interaction described in US11447993.

7. US20100251520A1 - Loose-Pin Hinge and Hinge Pin with Integrated Stop

• Full Citation: US20100251520A1, Salvatore Corso, "Loose-Pin Hinge and Hinge Pin with Integrated Stop", published October 7, 2010, filed April 1, 2009.
• Brief Description: This patent describes a loose-pin hinge with an integrated stop feature.
• Potential Anticipation (35 U.S.C. § 102): This patent is more relevant as it describes a hinge pin with an integrated stop. However, the mechanism of US11447993 is a separate security device, not the hinge itself, and its gravity-biased locking action, particularly the declining slide surface and locking channel interacting with a swing plate, is distinct from a simple hinge pin stop. It might potentially anticipate aspects of how a hinge pin interacts with a stopping mechanism, but not the overall claims of US11447993.

8. US20110156409A1 - Door guard

• Full Citation: US20110156409A1, Alvarenga Francisco J, "Door guard", published June 30, 2011, filed December 30, 2009.
• Brief Description: This patent describes a door guard device.
• Potential Anticipation (35 U.S.C. § 102): This is a general door security device. Without further details, it's difficult to assess direct anticipation, but the specific mechanical features of US11447993, such as the varied height receiver wall, declining slide surface, and gravity-driven locking swing plate, are likely to be distinguishable from a generic "door guard."

9. US8534721B1 - Closure restraint system

• Full Citation: US8534721B1, John H. Boggs, "Closure restraint system", published September 17, 2013, filed March 15, 2011.
• Brief Description: This patent describes a system for restraining a closure, such as a door.
• Potential Anticipation (35 U.S.C. § 102): This patent could be a significant reference given its title. A "closure restraint system" might encompass mechanisms for preventing a door from opening. A detailed comparison would be needed to determine if the specific elements of Claims 1 and 10, particularly the gravity-biased, vertically translating, and pivoting locking swing plate interacting with the mounting plate's declining slide surface and locking channel, are present in US8534721B1.

10. US20160298361A1 - Strike Plate Lock

• Full Citation: US20160298361A1, Robert Francis Dieguez, "Strike Plate Lock", published October 13, 2016, filed April 16, 2014.
• Brief Description: This patent describes a strike plate lock.
• Potential Anticipation (35 U.S.C. § 102): A strike plate lock is a common door security component. While it serves a similar purpose, the mechanism described in US11447993 is a distinct, supplementary security device mounted to the door jamb with a pivoting and translating locking swing plate, which is different from a typical strike plate enhancement. Therefore, direct anticipation of the specific claims of US11447993 is unlikely.

Summary of Potential Anticipation:

Based on the brief descriptions, none of the cited prior art appears to fully anticipate all elements of Claim 1 or Claim 10 of US11447993. The unique combination of a mounting plate with varying height receiver walls, a declining slide surface, and a locking channel, which cooperate with a gravity-biased, vertically translating, and pivoting locking swing plate to secure an in-swing door, seems to be a distinguishing feature.

However, the following patents warrant closer examination for potential obviousness challenges (under 35 U.S.C. § 103) or for specific elements within broader claims:

• US20100251520A1 (Loose-Pin Hinge and Hinge Pin with Integrated Stop): Could be relevant to the general concept of a stop mechanism interacting with a hinge pin.
• US8534721B1 (Closure restraint system): The broad nature of a "closure restraint system" means a detailed review is essential to determine if any of its embodiments contain elements similar enough to anticipate or render obvious the gravity-biased locking swing plate and its interaction with the mounting plate's varied receiver wall and channels.

Without access to the full details and drawings of these cited patents and a side-by-side comparison of each claim element, definitive statements about anticipation are difficult. The analysis above provides an initial assessment based on the titles and brief descriptions.