US3654940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for removing resinous or rubber deposits with organic peroxides
Assignee: Chemed Corp
•
Filing: 1970-11-25
•
Granted: 1972-04-11
•
Expires: 1990-11-25
Abstract
Abstract Method for removing resinous and rubber films and other deposits from processing equipment or other coated surfaces comprising first applying to the deposit a catalyzed organic solvent solution of an organic peroxide, then activating decomposition of the peroxide-treated deposit by heating for about 15 minutes to about 4 hours at temperatures of about 100* to about 240* Fahrenheit, and simultaneously or subsequently subjecting the ''''scorched'''' deposit to the action of an alkaline aqueous cleaning solution.
Inventors
- 👤 Jack Ritzi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:10
CPC Classifications
C; C09; C09D; C09D9/00; C08; C08F; C08F2/00; C08F2/008; C23; C23G; C23G5/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
11 words
Method of claim 1 wherein the undesired deposit is Neoprene rubber.
Claim 2
Dependent Claim
11 words
Method of claim 1 wherein the undesired deposit is poly(vinyl acetate).
Claim 3
Dependent Claim
13 words
Method of claim 1 wherein the undesired deposit is cured automobile tire compound.
Claim 4
Dependent Claim
27 words
Method of claim 1 wherein the aqueous alkAline cleaning solution employed in step (c) comprises at least about 2 percent by weight of free alkali metal hydroxide.
Claim 5
Dependent Claim
12 words
Method of claim 5 wherein the alkali metal hydroxide is sodium hydroxide.
Claim 6
Dependent Claim
17 words
Method of claim 1 wherein the peroxide employed in step (a) is di(tertiary-butyl) peroxide or tertiary-butyl perbenzoate.
Claim 7
Dependent Claim
27 words
Method of claim 7 wherein the peroxide decomposition catalyst is a heavy metal salt of a fatty acid having from about seven to about 24 carbon atoms.
Claim 8
Dependent Claim
11 words
Method of claim 8 wherein the metal salt is cobalt naphthenate.
References Cited (Backward Citations)
US2749313A
Cited
US2882237A
Cited
US3047435A
Cited
US3168477A
Cited
US3119720A
Cited
US3285777A
Cited
US3448509A
Cited
US3355385A
Cited
US3432347A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |