US2820723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inhibition of corrosion of phosphated metal surfaces
Assignee: Lubrizol Corp
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Filing: 1957-01-17
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Granted: 1958-01-21
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Expires: 1977-01-17
Abstract
No abstract record available.
Inventors
- 👤 Suer William M Le
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:19
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/82; C23C22/83; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/16; C07F9/165; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31529
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
THE PROCESS OF INHIBITING CORROSION OF PHOSPHATED METAL SURFACES WHICH COMPRISES APPLYING TO SAID SURFACES A FILM OF A PRODUCT PREPARED BY THE PROCESS WHICH COMPRISES THE REACTION OF (A) A ZINC SALT OF A PHOSPHORODITHIOIC ACID WITH (B) AN APPROXIMATELY EQUIVALENT AMOUNT OF AN ORGANIC EPOXIDE CONTAINING AT LEAST 4 ALIPHATIC CARBON ATOMS.
Claim 2
Dependent Claim
54 words
THE PROCESS OF INHIBITING CORROSION OF PHOSPHATED METAL SURFACES WHICH COMPRISES APPLYING TO SAID SURFACES A FILM OF A PRODUCT PREPARED BY THE PROCESS WHICH COMPRISES THE REACTION OF (A) A ZINC SALT OF A PHOSPHORODITHIOIC ACID WITH (B) AN APPROXIMATELY EQUIVALENT AMOUNT OF AN ORGANIC EPOXIDE CONTAINING AT LEAST 4 ALIPHATIC CARBON ATOMS.
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) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |