IP Library Granted Patent US 12,447,367
Granted Patent B1
US 12,447,367 · App. 18/106,277 · Granted Oct 21, 2025

System and method for packaging an absorbent for solidification of liquid medical waste

Inventor: Quint Barefoot (McLeansville, NC)
Assignee: STEWART SUPERABSORBENTS, LLC
A62D3/30A61M1/88B65D21/0233
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Quick Facts
Patent No.
US 12,447,367
App. No.
18/106,277
Granted
Oct 21, 2025
Kind
B1
Abstract

The invention includes a system and method for delivery and storage of an absorbent for solidification of liquid waste. The system includes a plurality of nestable containers configured to receive aqueous liquid to be solidified and forming a packet safe space when nested one within another. The system also includes a plurality of packets at least partially soluble in the aqueous liquid to be solidified. The containers include at least one packet and each packet contains a solidifier for use as an absorbent composition for the aqueous liquid to be solidified. A packet may be housed within the containers inside a packet safe space. The invention also includes an improved system and method for packaging a solidifier for solidification of liquid medical wastes.

Claims (20)

1. A system comprising:

a first medical waste container, the first container having a bottom and a projection that extends from a bottom inner surface of the first container, the first container being configured so that a second medical waste container is nestable within the first container and on the projection of the first container to form, between the first container and the second container nesting within the first container, a packet safe space between the bottom inner surface of the first container and a bottom surface of the second container;

within the packet safe space, a packet at least partially dissolvable in an aqueous liquid, the packet molded around at least a portion of the projection of the first container; and

an amount of solidifier, contained within the packet, capable of solidifying a volume of the aqueous liquid accommodated by the first container,

wherein, when the volume of the aqueous liquid is introduced into the one of the first container, the packet is configured to release at least a portion of the amount of solidifier into the volume of the aqueous liquid to achieve firm solidification of the introduced volume of the aqueous liquid.

2. The system of claim 1 ,

wherein a volume of the first container is between about 500 cc and about 16,000 cc, and

wherein the amount of solidifier within the packet is between about 1 gram and about 500 grams.

3. The system of claim 1 , wherein the solidifier comprises a sanitizer.

4. The system of claim 1 , further comprising adhesive securing the packet within the packet safe space.

5. The system of claim 1 , wherein the solidifier comprises a plurality of particles having a first diameter and a plurality of particles having a second diameter.

6. The system of claim 1 , wherein the amount of solidifier within the packet includes between about 15 grams and about 25 grams of a surface crosslinked superabsorbent polymer particle.

7. The system of claim 1 , wherein the packet comprises a first side having a first length and a second side having a second length, wherein the first length is at least twice the second length.

8. The system of claim 7 , wherein the packet is molded around at least the portion of the projection such that the first side extends circumferentially around the portion of the projection.

9. The system of claim 7 , wherein the packet is molded around at least the portion of the projection such that the second side extends along a height of the projection from the bottom inner surface of the first container.

10. The system of claim 1 , wherein the packet has an extended cylindrical shape with a rounded cross-section.

11. The system of claim 1 , wherein the packet safe space has a height between 1 cm and 4 cm.

12. The system of claim 1 , comprising a lid configured to attach to the first medical waste container, the lids having a port,

wherein the packet has a cross-section, and

wherein the cross-section is smaller than a dimension of the port and shaped substantially similar to the port.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 7, 2023
From: BAREFOOT, QUINT
To: STEWART SUPERABSORBENTS, LLC
Reel/Frame 062612/0505 →
Continuity (4)
Continuation 17479587 · Sep 20, 2021
Continuation 16122046 · Sep 5, 2018
Continuation 13966685 · Aug 14, 2013
Provisional Application 61682960 · Aug 14, 2012
References Cited (20)
US 2667422A · Kauffman · 1954 [cited by examiner]
US 2671602A · Vogt · 1954 [cited by applicant]
US 3526316A · Kalogris · 1970 [cited by applicant]
US 4096947A · Morse · 1978 [cited by examiner]
US 4419236A · Hsu · 1983 [cited by applicant]
US 4842138A · Sandel et al. · 1989 [cited by applicant]
US 5092858A · Benson et al. · 1992 [cited by applicant]
US 5284621A · Kaufman · 1994 [cited by applicant]
US 5391351A · Kaufman · 1995 [cited by applicant]
US 6797857B2 · Tanhehco · 2004 [cited by examiner]
US 7291674B2 · Kang et al. · 2007 [cited by applicant]
US 8450389B1 · Barefoot · 2013 [cited by applicant]
US 11123589B1 · Barefoot · 2021 [cited by applicant]
US 11571597B1 · Barefoot · 2023 [cited by applicant]
EP 1619136 · 2009 [cited by applicant]
BD, “BD Disposal Solutions Product Catalog,” Product Catalog, URL <http://www.bd.com/sharps/pdf/Disposal_Solutions_Product_Catalog.pdf>, available on or before Feb. 4, 2015, 16 pages. [cited by applicant]
Medi Gel Superabsorbent Polymers, Product description, retrieved on Apr. 2, 2018, 5 pages. [cited by applicant]
MSDS of Absorb-O-Gel, dated Feb. 14, 2005, retrieved from <http://www.medline.com/media/catalog/Docs/MSDS/mph17cd410%20-%20div.%2010.pdf>, 7 pages. [cited by applicant]
Norsocryl® S-35, Technical Data, retrieved on Apr. 2, 2018, 1 page. [cited by applicant]
Sumitomo SA60n Super Absorbent Polymer (SAP), Product description, retrieved on Apr. 2, 2018, 8 pages. [cited by applicant]