US4576837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating surfaces
Assignee: Tarancon Corp
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Filing: 1985-03-19
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Granted: 1986-03-18
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Expires: 2005-03-19
Abstract
Abstract The method of treating a surface chemically by exposing the surface to a treating gas at high pressure for a time during which a surface reaction occurs, and then reducing the pressure of the gas for a time and removing reaction byproducts and then continuing the cycles of high pressure and low pressure until the surface reaction is completed.
Inventors
- 👤 Gregorio Tarancon
- 👤 Efrain Acevedo
- 👤 Abel Saud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:45
CPC Classifications
B; B05; B05D; B05D3/00; B05D3/04; B05D3/0433; B05D3/044; B05D3/0446; C; C23; C23G; C23G5/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
132 words
The method of treating a surface comprising the steps of providing a gas in contact with the surface to be treated at a first pressure for a period of time, during which a chemical reaction takes place at the surface, reducing the pressure of the gas in contact with the surface to be treated for a second period of time, during which reaction byproduct are removed, re-establishing the first pressure of the gas in contact with the surface for a period of time during which the reaction takes place again, again reducing the pressure of the gas in contact with the surface for a period of time during which reaction byproduct are removed, and continuing the cycle of the first pressure and the reduced pressure until the surface has the desired characteristics.
Claim 2
Independent Claim
132 words
The method of treating a surface comprising the steps of providing a gas in contact with the surface to be treated at a first pressure for a period of time, during which a chemical reaction takes place at the surface, reducing the pressure of the gas in contact with the surface to be treated for a second period of time, during which reaction byproduct are removed, re-establishing the first pressure of the gas in contact with the surface for a period of time during which the reaction takes place again, again reducing the pressure of the gas in contact with the surface for a period of time during which reaction byproduct are removed, and continuing the cycle of the first pressure and the reduced pressure until the surface has the desired characteristics.
Claim 3
Independent Claim
147 words
The method of treating the surfaces of polyethylene containers comprising the steps of loading polyethylene containers into a closed vessel, heating said containers to an elevated treating temperature, providing fluorine gas in contact with the container surfaces to be treated at a first pressure for a period of time, during which a chemical reaction takes place at the surface, reducing the pressure of the gas in contact with the surface to be treated for a second period of time, during which reaction byproducts are removed, re-establishing the first pressure of the gas in contact with the surface for a period of time, during which the reaction takes place again, again reducing the pressure of the gas in contact with the surface for a period of time, during which reaction byproducts are removed, and continuing the cycle of the first pressure until the surface has the desired characteristics.
Claim 4
Independent Claim
147 words
The method of treating the surfaces of polyethylene containers comprising the steps of loading polyethylene containers into a closed vessel, heating said containers to an elevated treating temperature, providing fluorine gas in contact with the container surfaces to be treated at a first pressure for a period of time, during which a chemical reaction takes place at the surface, reducing the pressure of the gas in contact with the surface to be treated for a second period of time, during which reaction byproducts are removed, re-establishing the first pressure of the gas in contact with the surface for a period of time, during which the reaction takes place again, again reducing the pressure of the gas in contact with the surface for a period of time, during which reaction byproducts are removed, and continuing the cycle of the first pressure until the surface has the desired characteristics.
Claim 5
Independent Claim
152 words
The method of treating the surface of polyethylene containers comprising the steps of loading polyethylene containers into first and second closed vessels, heating said containers in said vessels to an elevated treating temperature, providing fluorine gas in contact with the container surfaces to be treated at a first pressure in one vessel for a period of time, during which a chemical reaction takes place at the surface, and at a reduced pressure in the other vessel, reducing the pressure of the gas in contact with the surface to be treated in the one vessel for a second period of time, during which reaction byproducts are removed, and increasing the pressure of the gas in the other vessel for a period of time, during which the reaction takes place again, and continuing the cycle of alternating the first pressure and reduced pressure in the two vessels until the surfaces have the desired characteristics.
Claim 6
Independent Claim
152 words
The method of treating the surface of polyethylene containers comprising the steps of loading polyethylene containers into first and second closed vessels, heating said containers in said vessels to an elevated treating temperature, providing fluorine gas in contact with the container surfaces to be treated at a first pressure in one vessel for a period of time, during which a chemical reaction takes place at the surface, and at a reduced pressure in the other vessel, reducing the pressure of the gas in contact with the surface to be treated in the one vessel for a second period of time, during which reaction byproducts are removed, and increasing the pressure of the gas in the other vessel for a period of time, during which the reaction takes place again, and continuing the cycle of alternating the first pressure and reduced pressure in the two vessels until the surfaces have the desired characteristics.
References Cited (Backward Citations)
CA788973A
Cited
GB710523A
Cited
US2829070A
Cited
US2811468A
Cited
US3988491A
Cited
US3940520A
Cited
US4268538A
Cited
US4296151A
Cited
US4474828A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-17 | 1989-09-16 | 1990-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-17 | 1993-09-16 | 1994-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-17 | 1997-09-16 | 1998-03-18 | $7700.00 | Window Closed / Lapsed |