US4091123A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the manufacture of a steel sheet having excellent lubricating property
Assignee: Nippon Steel Corp
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Filing: 1976-06-14
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Granted: 1978-05-23
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Expires: 1996-06-14
Abstract
Abstract A steel sheet having a two-layer film which exhibits excellent lubricating properties under press working can be manufactured by one step coating. In this case the coating composition after being applied to the sheet is irradiated with ionizing radiant energy, i.e., radioactive ray or electromagnetic wave, in an atmosphere containing an oxidizing substance.
Inventors
- 👤 Saburo Ayusawa
- 👤 Takeo Nagashima
- 👤 Masaya Tsutsumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:32
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
142 words
A method for manufacturing a steel sheet having an anti-galling lubricative coating effective during severe press working thereof which comprises applying to a surface of a steel sheet a layer of a liquid coating composition whose main constituent is selected from the group of monomers and polymers that become solid when cured by irradiating with ionizing radiant energy in an oxygen-free environment but remain at least semi-liquid when the molecules thereof are contacted by oxygen while so irradiated, and subjecting said layer to irradiation with ionizing radiant energy while the exposed surface of said layer is in contact with an oxygen bearing atmosphere until a layer of said coating composition in contact with said sheet has become cured and solid while a surface layer of said composition on said cured layer has reacted with said oxygen and remains in said semi-liquid state.
Claim 2
Independent Claim
142 words
A method for manufacturing a steel sheet having an anti-galling lubricative coating effective during severe press working thereof which comprises applying to a surface of a steel sheet a layer of a liquid coating composition whose main constituent is selected from the group of monomers and polymers that become solid when cured by irradiating with ionizing radiant energy in an oxygen-free environment but remain at least semi-liquid when the molecules thereof are contacted by oxygen while so irradiated, and subjecting said layer to irradiation with ionizing radiant energy while the exposed surface of said layer is in contact with an oxygen bearing atmosphere until a layer of said coating composition in contact with said sheet has become cured and solid while a surface layer of said composition on said cured layer has reacted with said oxygen and remains in said semi-liquid state.
Claim 3
Dependent Claim
19 words
A method according to claim 1 in which said coating composition contains a lubricant incompatible with the coating composition.
Claim 4
Dependent Claim
22 words
A method according to claim 1 in which the number of double bonds per each molecule of said coating composition is one.
Claim 5
Dependent Claim
22 words
A method according to claim 2 in which the number of double bonds per each molecule of said coating composition is one.
Claim 6
Dependent Claim
15 words
A method according to claim 1 in which said coating composition contains a polymerization initiator.
Claim 7
Dependent Claim
16 words
A method according to claim 2 in which said coating composition further contains a polymerization initiator.
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-22 | 1981-11-21 | 1982-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-22 | 1985-11-21 | 1986-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-22 | 1989-11-21 | 1990-05-23 | $7700.00 | Window Closed / Lapsed |