US3658565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Parting compound containing chromium oxide manganese dioxide and a liquid inorganic carrier
Assignee: Lukens Inc
•
Filing: 1969-01-29
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Granted: 1972-04-25
•
Expires: 1989-01-29
Abstract
Abstract A parting composition, including a mixture of manganese dioxide and an oxide of chromium, can be applied to the contacting surfaces of metal sheets and plates in assemblies to be hot worked. The parting composition prevents adhesion between those surfaces to which it is applied. After hot working, the composition can be easily removed from the treated surfaces with an acid pickling solution.
Inventors
- 👤 James J Mcglynn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:16
CPC Classifications
B; B21; B21B; B21B1/00; B21B1/38; C; C21; C21D; C21D1/00; C21D1/68
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
17 words
The composition of claim 1 wherein the slurry is water based with water glass as a binder.
Claim 2
Dependent Claim
26 words
The composition of claim 1 wherein the oxide of chromium is Cr2O3 and the volume ratio of Cr2O3 to MnO2 is about 0.3 - 1 to
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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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |