US4710023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Measurement of contact lenses
Assignee: RUXLEY HOLDINGS Ltd
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Filing: 1986-09-29
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Granted: 1987-12-01
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Expires: 2006-09-29
Abstract
Abstract One or more optical parameters of a contact lens can be measured with the lens contained in aqueous fluid sealed in a sachet of optically acceptable plastics film.
Inventors
- 👤 Ronald Loveridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:54
CPC Classifications
G; G01; G01B; G01B11/00; G01M; G01M11/00; G01M11/02; G01M11/0207
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
50 words
In a method for measurement of one or more optical parameters of a contact lens, the improvement comprising the step of taking the measurement while the lens is contained in an aqueous fluid in a sealed sachet of plastics film of composition optically compatible with the measurements to be taken.
Claim 2
Dependent Claim
50 words
In a method for measurement of one or more optical parameters of a contact lens, the improvement comprising the step of taking the measurement while the lens is contained in an aqueous fluid in a sealed sachet of plastics film of composition optically compatible with the measurements to be taken.
Claim 3
Dependent Claim
14 words
A method according to claim 1, wherein the sachet is of a polyester film
Claim 4
Dependent Claim
27 words
A method according to claim 1 wherein the aqueous fluid is sterile saline and the step of taking the measurement includes taking the measurement with a keratometer.
Claim 5
Dependent Claim
14 words
A method according to claim 1, wherein the sachet is sealed by heat sealing.
Claim 6
Dependent Claim
22 words
A method according to claim 1, wherein the lens is supported or positioned with the aid of a support within the sachet.
Claim 7
Dependent Claim
30 words
A method according to claim 1 in which the measurement to be taken is selected from the group consisting of back vertex power, back central optic radius or lens diameter.
Claim 8
Dependent Claim
41 words
A sachet of plastics film containing an aqueous fluid and a contact lens, said film and fluid being of compositions optically compatible respectively for taking measurements of optical parameters of said contact lens while contained within said fluid and said film.
Claim 9
Dependent Claim
41 words
A sachet of plastics film containing an aqueous fluid and a contact lens, said film and fluid being of compositions optically compatible respectively for taking measurements of optical parameters of said contact lens while contained within said fluid and said film.
Claim 10
Dependent Claim
74 words
In a method for optical measurement of one or more optical parameters of a contact lens, the improvement comprising the steps of enclosing the lens to be measured in an aqueous fluid sealed in a sachet of plastics film optically compatible with the measurements to be taken and, with a keratometer positioned exterior of the sachet, measuring the optical parameters of the lens with the keratometer while the lens is contained in the sachet.
Claim 11
Dependent Claim
74 words
In a method for optical measurement of one or more optical parameters of a contact lens, the improvement comprising the steps of enclosing the lens to be measured in an aqueous fluid sealed in a sachet of plastics film optically compatible with the measurements to be taken and, with a keratometer positioned exterior of the sachet, measuring the optical parameters of the lens with the keratometer while the lens is contained in the sachet.
Claim 12
Dependent Claim
30 words
A method according to claim 8 in which the measurement to be taken is selected from the group consisting of back vertex power, back central optic radius or lens diameter.
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) | 1990-11-30 | 1991-06-01 | 1991-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-30 | 1995-06-01 | 1995-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-30 | 1999-06-01 | 1999-12-01 | $7700.00 | Window Closed / Lapsed |