US4214014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for surface treatment of contact lenses
Assignee: Ciba Vision GmbH
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Filing: 1978-10-12
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Granted: 1980-07-22
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Expires: 1998-10-12
Abstract
Abstract Surface treatment for hard or dehydrated hydrophilic contact lenses, to reduce the deposit of impurities thereon, comprising subjecting the lens, after shaping and polishing, to a gas discharge, e.g., in an oxygen atmosphere.
Inventors
- 👤 Peter Hofer
- 👤 Wolfgang Kohl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:04
CPC Classifications
B; B29; B29C; B29C59/00; B29C59/14; B29L; B29L2011/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
62 words
Method for treating the surface of a hard or dehydrated hydrophilic contact lens, which method comprises introducing a lens which has been shaped and polished into a container, evacuating the container, flushing same with an oxygen-containing atmosphere, re-evacuating to an absolute pressure of 10 mm Hg or less and then initiating a gas discharge and subjecting the lens to said gas discharge.
Claim 2
Dependent Claim
62 words
Method for treating the surface of a hard or dehydrated hydrophilic contact lens, which method comprises introducing a lens which has been shaped and polished into a container, evacuating the container, flushing same with an oxygen-containing atmosphere, re-evacuating to an absolute pressure of 10 mm Hg or less and then initiating a gas discharge and subjecting the lens to said gas discharge.
Claim 3
Dependent Claim
15 words
Method as claimed in claim 1, wherein the gas discharge is generated by glow discharge.
Claim 4
Dependent Claim
16 words
Method as claimed in claim 1, wherein the gas discharge occurs in an alternating electromagnetic field.
Claim 5
Dependent Claim
15 words
Method as claimed in claim 3, wherein the gas discharge occurs in an oxygen atmosphere.
Claim 6
Dependent Claim
15 words
Method as claimed in claim 1, wherein the gas discharge occurs in an oxygen atmosphere.
Claim 7
Dependent Claim
39 words
Method as claimed in claim 5, comprising introducing the contact lens into a container, evacuating the container, flushing with oxygen and then re-evacuating to an absolute pressure of 10 mm Hg or less, and then initiating the gas discharge.
Claim 8
Dependent Claim
21 words
Method as claimed in claim 6, wherein the oxygen atmosphere has a pressure of 0.01 mm Hg during the gas discharge.
Claim 9
Dependent Claim
35 words
Method as claimed in claim 7, wherein the gas discharge is effected with a current intensity in the range of 10 to 100 mA and a voltage in the range of 200 to 1000 V.
Claim 10
Dependent Claim
35 words
Method as claimed in claim 6, wherein the gas discharge is effected with a current intensity in the range of 10 to 100 mA and a voltage in the range of 200 to 1000 V.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-07-22 | 1984-01-21 | 1984-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-22 | 1988-01-21 | 1988-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-22 | 1992-01-21 | 1992-07-22 | $7700.00 | Window Closed / Lapsed |