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US4587027A Expired / Lapsed US ⏱️ 0.0 years remaining

Antifreeze for potable water

Assignee: UNITED STATES MOVIDYN Corp AN ILL CORP
•
Filing: 1984-09-16
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Granted: 1986-05-06
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Expires: 2004-09-16
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Abstract

Abstract Potable (drinking) water systems of recreational vehicles, boats, vacation homes, and the like, need to be protected against freezing during periods of non-use during the cold winter season. Typical propylene glycol antifreeze additives are effective but expensive. It has been found that use of an inhibitor solution based on food-grade corn syrup effectively boosts the effectiveness of propylene glycol so that as little as 19% plus or minus 0.25% by liquid volume is optimally used together with about 10% of a food-grade corn syrup in an anti-freeze solution for -50% protection. This is a more economical and effective system than previously known in commercialized systems heretofore maintained as trade secrets by the inventors and the assignee.

Inventors

  • 👤 Robert W. Preusch
  • 👤 Thomas F. O'Farrell
  • 👤 Ollie O'Neal, Jr.

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 19:12
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/20

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 62 words
A liquid solution, for use in potable water systems, which substantially withstands freezing and damaging expansion to temperatures of 50° Fahrenheit below zero (minus 45° C.), comprising 14.12% by liquid volume of an inhibitor solution comprising about 70.941% food-grade corn syrup, 29.047% water, 0.007% food-grade coloring dye, and 0.005% preservative; 19.00% plus or minus 0.25% food-grade propylene glycol; and the balance water.
Claim 2
Dependent Claim 62 words
A liquid solution, for use in potable water systems, which substantially withstands freezing and damaging expansion to temperatures of 50° Fahrenheit below zero (minus 45° C.), comprising 14.12% by liquid volume of an inhibitor solution comprising about 70.941% food-grade corn syrup, 29.047% water, 0.007% food-grade coloring dye, and 0.005% preservative; 19.00% plus or minus 0.25% food-grade propylene glycol; and the balance water.
Claim 3
Dependent Claim 65 words
A liquid solution, for use in potable water systems, which substantially withstands freezing and damaging expansion to temperatures of 60° Fahrenheit below zero (minus 51° C.), comprising 12.35% by liquid volume of an inhibitor solution comprising about 70.941% food-grade corn syrup, 29.047% water, 0.007% food-grade coloring dye, and 0.005% formaldehyde as a preservative; 29.125% plus or minus 0.25% food-grade propylene glycol; and the balance water.
Claim 4
Dependent Claim 65 words
A liquid solution, for use in potable water systems, which substantially withstands freezing and damaging expansion to temperatures of 60° Fahrenheit below zero (minus 51° C.), comprising 12.35% by liquid volume of an inhibitor solution comprising about 70.941% food-grade corn syrup, 29.047% water, 0.007% food-grade coloring dye, and 0.005% formaldehyde as a preservative; 29.125% plus or minus 0.25% food-grade propylene glycol; and the balance water.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1989-05-05 1989-11-04 1990-05-06 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1993-05-05 1993-11-04 1994-05-06 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1997-05-05 1997-11-04 1998-05-06 $7700.00 Window Closed / Lapsed

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