US3969255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipe cleaning composition
Assignee: Individual
•
Filing: 1974-04-01
•
Granted: 1976-07-13
•
Expires: 1994-04-01
Abstract
Abstract A pipe cleaning composition containing hydrochloric acid, furfural, dialkylthiourea, benzyl thiocyanate and water has a reduced tendency to attack steel or copper pipe.
Inventors
- 👤 George F. Connelly, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:28
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C23G1/04; C23G1/06
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
66 words
A pipe cleaning composition comprising an aqueous solution containing from about 7.5 to 25 parts by weight of hydrochloric acid, and a combination of inhibitors consisting essentially of 0.6 to 2.6 parts by weight of furfural, 0.5 to 1.4 parts by weight of a dialkylthiourea wherein the alkyl groups contain up to about 4 carbon atoms, and 0.05 to 0.21 parts by weight of benzyl thiocyanate.
Claim 2
Dependent Claim
66 words
A pipe cleaning composition comprising an aqueous solution containing from about 7.5 to 25 parts by weight of hydrochloric acid, and a combination of inhibitors consisting essentially of 0.6 to 2.6 parts by weight of furfural, 0.5 to 1.4 parts by weight of a dialkylthiourea wherein the alkyl groups contain up to about 4 carbon atoms, and 0.05 to 0.21 parts by weight of benzyl thiocyanate.
Claim 3
Dependent Claim
14 words
A pipe cleaning composition as described in claim 1, wherein the dialkylthiourea is diethylthiourea.
Claim 4
Dependent Claim
46 words
A pipe cleaning composition which essentially consists of: Parts by Weight
hydrochloric acid
7.5 to 25
furfural 0.6 to 2.6
dialkylthiourea 0.5 to 1.4
wherein the alkyl groups
contain up to about 4
carbon atoms
benzyl thiocyanate
0.05 to 0.21, the balance consisting essentially of water.
Claim 5
Dependent Claim
46 words
A pipe cleaning composition which essentially consists of: Parts by Weight
hydrochloric acid
7.5 to 25
furfural 0.6 to 2.6
dialkylthiourea 0.5 to 1.4
wherein the alkyl groups
contain up to about 4
carbon atoms
benzyl thiocyanate
0.05 to 0.21, the balance consisting essentially of water.
Claim 6
Dependent Claim
14 words
A pipe cleaning composition as described in claim 3, wherein the dialkylthiourea is diethylthiourea.
Claim 7
Dependent Claim
34 words
A pipe cleaning composition as described in claim 4, which comprises: Parts by Weight
______________________________________
HCl about 10
furfural about 1.3
diethylthiourea about 0.7
benzyl thiocyanate
about 0.1,
______________________________________ the balance being essentially water.
Claim 8
Independent Claim
103 words
A method of removing a scale deposit from metal surfaces normally in contact with water, which deposit includes at least one alkaline earth metal carbonate, which method comprises contacting said scale deposit with an aqueous composition containing from about 7.5 to 25 parts by weight of hydrochloric acid, and a combination of inhibitors consisting essentially of about 0.6 to 2.6 parts by weight of furfural about 0.5 to 1.4 parts by weight of dialkylthiourea wherein the alkyl groups contain up to about 4 carbon atoms, and about 0.05 to 0.21 parts by weight of benzyl thiocyanate, whereby said deposit is dissolved and/or dispersed.
Claim 9
Independent Claim
103 words
A method of removing a scale deposit from metal surfaces normally in contact with water, which deposit includes at least one alkaline earth metal carbonate, which method comprises contacting said scale deposit with an aqueous composition containing from about 7.5 to 25 parts by weight of hydrochloric acid, and a combination of inhibitors consisting essentially of about 0.6 to 2.6 parts by weight of furfural about 0.5 to 1.4 parts by weight of dialkylthiourea wherein the alkyl groups contain up to about 4 carbon atoms, and about 0.05 to 0.21 parts by weight of benzyl thiocyanate, whereby said deposit is dissolved and/or dispersed.
Claim 10
Dependent Claim
12 words
A method as described in claim 6, wherein said dialkylthiourea is diethylthiourea.
Claim 11
Dependent Claim
19 words
A method as described in claim 6, wherein said composition is continuously circulated in contact with said scale deposit.
Claim 12
Dependent Claim
12 words
A method as described in claim 8, wherein said dialkylthiourea is diethylthiourea.
Claim 13
Independent Claim
98 words
A method of inhibiting scale formation in circulating water systems which comprises forming scale inhibiting solution by adding to the water in said system a small amount of a composition containing from about 7.5 to 25 parts by weight of hydrochloric acid, and a combination of inhibitors consisting essentially of about 0.6 to about 2.6 parts by weight of furfural, about 0.5 to 1.4 parts by weight of dialkylthiourea wherein the alkyl groups contain up to about 4 carbon atoms, and about 0.05 to 0.21 parts by weight of benzyl thiocyanate and circulating said solution through said system.
Claim 14
Independent Claim
98 words
A method of inhibiting scale formation in circulating water systems which comprises forming scale inhibiting solution by adding to the water in said system a small amount of a composition containing from about 7.5 to 25 parts by weight of hydrochloric acid, and a combination of inhibitors consisting essentially of about 0.6 to about 2.6 parts by weight of furfural, about 0.5 to 1.4 parts by weight of dialkylthiourea wherein the alkyl groups contain up to about 4 carbon atoms, and about 0.05 to 0.21 parts by weight of benzyl thiocyanate and circulating said solution through said system.
Claim 15
Dependent Claim
12 words
A method as described in claim 10, wherein said dialkylthiourea is diethylthiourea.
Claim 16
Dependent Claim
15 words
A method as described in claim 10, wherein said water system is a closed system.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |