US3664965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Formaldehyde-gelatin composition for gas pressure testing which forms a long lasting foam
Assignee: Mitsubishi Heavy Industries Ltd
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Filing: 1970-01-28
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Granted: 1972-05-23
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Expires: 1990-01-28
Abstract
Abstract Leak detecting agent for gas pressure testing consisting essentially of an aqueous solution of a coagulating agent present in an amount of 1.8-18 percent by weight of the solution and a foaming agent present in an effective amount to cause the formation of bubbles indicating the site of the leak, the solution also including an addition of an acid in an amount to adjust the pH range of the solution from 3-6, said range promoting hardening of a film formed from the solution upon elimination of water, and preservation of the bubbles in said film for many hours, thus enabling an observer to detect theleakage at a time convenient for inspection.
Inventors
- 👤 Nobuyoshi Hirota
- 👤 Yoshio Onoshima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:05
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/12; C; C08; C08J; C08J9/00; C08J9/30; G01M3/14; G01M3/146; G01M3/20; G01M3/202; Y; Y10; Y10S; Y10S252/00; Y10S252/964
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
26 words
The composition according to claim 1, wherein the sorbitane in the sorbitane monolaurate is a member selected from the group consisting of 1,5- sorbitane and 1,4,3,6-sorbitane.
Claim 2
Dependent Claim
23 words
The composition according to claim 1, wherein the gelatin is used at a temperature in the range of -5* C. and +40* C.
Claim 3
Dependent Claim
31 words
The composition according to claim 1, wherein the coagulating agent consists of at least 1.8 percent by weight of gelatin and at least 1.8 percent by weight of resin member (i).
Claim 4
Dependent Claim
39 words
The composition according to claim 1, wherein the coagulating agent consists essentially of (i) 1.8 percent by weight urea resin solution containing urea-formaldehyde, and (ii) 1.8 percent by weight gelatin; the foaming agent is 0.9 percent by weight dodecylbengenesulfonate.
Claim 5
Dependent Claim
16 words
The composition according to claim 5 wherein 4.5 percent of phosphoric acid (1/10) solution is used.
Claim 6
Dependent Claim
39 words
The composition of claim 1 wherein the coagulating agent consists essentially of (i) 1.0 percent by weight cresol formaldehyde resin and (ii) 4.5 percent by weight gelatin; the foaming agent is 0.45 percent by weight oleyl diethyl ethylene diamine.
Claim 7
Dependent Claim
30 words
A leak detecting composition which comprises Gelatin 4.5%Oleyl diethyl ethylene diamine 0.45%Formalin 2.7%Mono-octadecylamine 1.35%Cresol formaldehyde resin 1.00%Water 90.00% all of said percentages being by weight based on the total composition.
Claim 8
Dependent Claim
32 words
A leak detecting composition which comprises urea resin (75% urea formaldehyde)solution 1.8%Gelatin 1.8%Dodecylbenzene sulfonate 0.9%Phosphoric acid solution (1/10) 4.5%Water 91.00% all of said percentages being by weight based on the total composition.
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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |