IP Library › Granted Patent US 12,384,968
Granted Patent B2
US 12,384,968 · App. 17/981,968 · Granted Aug 12, 2025

Inhibited hydrofluoric acid composition

Inventors: Clay Purdy (Medicine Hat, CA); Markus Weissenberger (Calgary, CA); Karl W. Dawson (Calgary, CA); Kyle G. Wynnyk (Calgary, CA)
Assignee: DORF KETAL CHEMICALS FZE
C09K13/08C03C15/00C09K8/528C09K8/72C23F1/16
View Patent ↗
Loading inventors, assignments & file history…
Monitor This Case
Get email alerts when status or documents change.
Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 12,384,968
App. No.
17/981,968
Granted
Aug 12, 2025
Kind
B2
Abstract

An inhibited hydrofluoric acid aqueous composition, said composition comprising: hydrofluoric acid in solution; and a weak base selected from the group consisting of: lysine, arginine, histidine, glutamine, asparagine, tryptophan, and tyrosine; wherein said weak base and hydrofluoric acid are present in a molar ratio of at least 1:1. Also disclosed is a mud acid using this inhibited acid composition.

Claims (8)

1. A method of preparing an inhibited hydrofluoric acid composition, said method consisting of:

providing a pre-determined amount of hydrofluoric acid;

providing a weak base selected from the group consisting of glutamine, asparagine, tryptophan and tyrosine;

adding the weak base into the hydrofluoric acid until the molar ratio of weak base:hydrofluoric acid is at least 1.1:1.

2. The method of claim 1 , wherein the weak base is glutamine.

3. The method of claim 1 , wherein the weak base is asparagine.

4. The method of claim 1 , wherein the weak base is tryptophan.

5. The method of claim 1 , wherein the weak base is tyrosine.

Assignments (4)
SECURITY INTEREST Recorded Dec 12, 2023
From: DORF KETAL CHEMICALS FZE
To: HSBC BANK MIDDLE EAST LIMITED
Reel/Frame 065878/0104 →
CORRECTIVE ASSIGNMENT TO CORRECT THE PRIOR ERRONEOUS RECORDATION OF ASSIGNMENT APPLICATION NUMBERS: 15614284, 17148881 PREVIOUSLY RECORDED ON REEL 063118 FRAME 0689. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNMENT. Recorded May 17, 2023
From: FLUID ENERGY GROUP LTD.
To: DORF KETAL CHEMICALS FZE
Reel/Frame 063695/0522 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 20, 2023
From: FLUID ENERGY GROUP LTD.
To: DORF KETAL CHEMICALS FZE
Reel/Frame 063118/0689 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Nov 7, 2022
From: PURDY, CLAY; WEISSENBERGER, MARKUS; DAWSON, KARL W.; WYNNYK, KYLE G.
To: FLUID ENERGY GROUP LTD
Reel/Frame 061677/0124 →
Priority Claims (1)
CA 3039288 · Apr 5, 2019 · national
Continuity (2)
Division 16839631 · Apr 3, 2020
Related Publication 20230082332A1 · Mar 16, 2023
References Cited (12)
US 3413326A · Schmid · 1968 [cited by applicant]
US 3936316A · Galla · 1976 [cited by applicant]
US 4064138A · Saari et al. · 1977 [cited by applicant]
US 4876688A · Wang · 1989 [cited by examiner]
US 8389453B2 · Thomson · 2013 [cited by applicant]
US 10035949B2 · Gill et al. · 2018 [cited by applicant]
US 20030227024A1 · Yoshii et al. · 2003 [cited by applicant]
US 20180044042A1 · Jiang · 2018 [cited by examiner]
US 20200158638A1 · Agrawal et al. · 2020 [cited by applicant]
US 20200317516A1 · Purdy et al. · 2020 [cited by applicant]
US 20200317996A1 · Purdy et al. · 2020 [cited by applicant]
WO 2016033259A1 · 2016 [cited by applicant]