Patent US2111389A successfully refreshed from Google Patents.
Patent US3607756A successfully refreshed from Google Patents.
US3607756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat transfer liquid and use
Assignee: The Campbell's Co
•
Filing: 1968-03-22
•
Granted: 1971-09-21
•
Expires: 1988-03-22
Abstract
Abstract A liquid composition, having a freezing point well below the freezing point of water and adapted for use as a liquid heat transfer composition at low temperatures, is provided which consists essentially of propylene glycol, propylene carbonate and water, in defined proportions. Typical advantageous uses for the composition include use as a defrosting and as a coolant (including freezing) liquid.
Inventors
- 👤 Wendell F Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:16
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/02; C09K5/06; C09K5/066
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
22 words
The composition of claim 1 wherein the proportion, by volume, of said propylene glycol to said propylene carbonate is greater than 1:1.
Claim 2
Dependent Claim
21 words
The composition of claim 2 wherein the proportion of propylene glycol to propylene carbonate is from about 2:1 to about 3:1.
Claim 3
Dependent Claim
48 words
The composition of claim 1 wherein said propylene glycol is present in an amount from about 40 to about 65%, said propylene carbonate is present in an amount from about 5 to about 30%, and said water is present in an amount from about 20 to about 50%.
Claim 4
Dependent Claim
25 words
The composition of claim 4 wherein the proportion, by volume, of said propylene glycol to said propylene carbonate is from about 2:1 to about 3:1.
Claim 5
Dependent Claim
48 words
The composition of claim 4 wherein said propylene glycol is present in an amount from about 45 to about 60%, said propylene carbonate is present in an amount from about 20 to about 30%, and said water is present in an amount from about 20 to about 40%.
Claim 6
Dependent Claim
25 words
The composition of claim 6 wherein the proportion, by volume, of said propylene glycol to said propylene carbonate is from about 2:1 to about 3:1.
Claim 7
Dependent Claim
22 words
The composition of claim 1 wherein the proportion, by volume, of said propylene carbonate to said propylene glycol is greater than 1:1.
Claim 8
Dependent Claim
48 words
The composition of claim 1 wherein said propylene glycol is present in an amount from about 5 to about 45%, said propylene carbonate is present in an amount from about 20 to about 85%, and said water is present in an amount from about 5 to about 25%.
Claim 9
Dependent Claim
20 words
The composition of claim 9 wherein the proportion, by volume, of propylene carbonate to propylene glycol is greater than 1:1.
Claim 10
Dependent Claim
53 words
In the method of heat exchange wherein a material at one temperature is contacted with a liquid at another temperature and wherein a temperature below the freezing point of water is encountered by said liquid at least some time during its use, the improvement wherein said liquid is the composition of claim 1.
Claim 11
Dependent Claim
35 words
In the method of inhibiting the accumUlation of ice on a cold solid surface wherein said surface is contacted with a defrosting liquid, the improvement wherein said defrosting liquid is the composition of claim 4.
Claim 12
Dependent Claim
35 words
In the method of inhibiting the accumulation of ice on a cold solid surface wherein said surface is contacted with a defrosting liquid, the improvement wherein said defrosting liquid is the composition of claim 9.
Claim 13
Dependent Claim
38 words
In the cooling of a material wherein said material is contacted with a liquid having a lower temperature until the material is cooled to the desired extent, the improvement wherein said liquid is the composition of claim 4.
Claim 14
Dependent Claim
38 words
In the cooling of a material wherein said material is contacted with a liquid having a lower temperature until the material is cooled to the desired extend, the improvement wherein said liquid is the composition of claim 9.
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |