Patent US3629004A successfully refreshed from Google Patents.
US3629004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paint-removing method
Assignee: WR Grace and Co
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Filing: 1969-04-17
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Granted: 1971-12-21
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Expires: 1989-04-17
Abstract
Abstract A method for removing paint from metal surfaces by boiling a solvent or solvent mixture and contacting the painted metal surface with the vapors of the solvent or solvent mixture. The solvent may include chlorinated liquid hydrocarbons, hydrogenated aromatic solvents, saturated heterocyclic compounds, surface active agents, imidazole derivatives, alkynyl alcohols, glycol ethers, carboxylic acids, ethanolated alkyl guanidine amine complexes, and aliphatic alcohols.
Inventors
- 👤 Joseph Cooper
- 👤 William James Corbett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:51
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/22; C11D7/26; C11D7/261; C09; C09D; C09D9/00; C09D9/005; C11D3/00; C11D3/43; C11D7/50; C11D7/5004; C11D7/5009; C11D7/5013; C11D7/5018; C11D7/5022; C11D2111/00; C11D2111/10; C11D2111/14; C11D2111/16; C11D7/24; C11D7/263; C11D7/265; C11D7/28; C11D7/32; C11D7/34
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
21 words
The method of claim 1 wherein the volatile solvent further includes 6 parts by weight of linear dodecyl benzene sulfonic acid.
Claim 2
Dependent Claim
69 words
The method of claim 2 wherein methylene chloride is present in an amount of 63.76 parts by weight, formic acid is present in an amount of 17 parts by weight, the imidazoline surfactant is present in an amount of 6 parts by weight, the said benzene sulfonic acid is present in an amount of 6 parts by weight; and the solvent further includes 11.25 parts by weight of perchloroethylene.
Claim 3
Dependent Claim
68 words
The method of claim 2 wherein methylene chloride is present in an amount of 74.5 parts by weight, formic acid is present in an amount of 9.3 parts by weight, the imidazoline surfactant is present in an amount of 5.5 parts by weight, the said benzene sulfonic acid is present in an amount of 7 parts by weight; and the solvent further includes 3.7 parts by weight water.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |