Patent US3689673A successfully refreshed from Google Patents.
US3689673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
The process of soaking and sterilizing hydrophilic soft contact lenses with chlorhexidene
Assignee: Barnes Hind Pharmaceuticals Inc
•
Filing: 1970-11-10
•
Granted: 1972-09-05
•
Expires: 1990-11-10
Abstract
Abstract Chlorhexidene solutions are employed to sterilize and soak both hard and soft contact lenses.
Inventors
- 👤 Russell E Phares Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:07
CPC Classifications
A; A61; A61L; A61L12/00; A61L12/08; A61L12/14; A61L12/141
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
23 words
The process of claim 1 wherein the chlorhexidene is, employed as a salt selected from the group consisting of digluconate, diacetate and dihydrochloride.
Claim 2
Dependent Claim
17 words
The process of claim 1 wherein the aqueous solution is an isotonic solution containing an isotonic agent.
Claim 3
Dependent Claim
29 words
The process of claim 3 wherein the isotonic agent is selected from the group consisting of sodium chloride, sodium citrate, boric acid, sodium nitrate, propylene glycol, glycerine and mannitol.
Claim 4
Dependent Claim
16 words
The process of claim 1 wherein The aqueous solution has a pH of 4.5 to 8.5.
Claim 5
Dependent Claim
11 words
The process of claim 5 wherein the pH is about 7.4.
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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |