Patent US4879710A successfully refreshed from Google Patents.
US4879710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical disc protector and method for applying same
Assignee: CASTANEDA MARIA
•
Filing: 1988-04-20
•
Granted: 1989-11-07
•
Expires: 2008-04-20
Abstract
Abstract A semi-permanent disc protector for shielding an optical disc against surface scratches. The disc protector comprises a transparent annular sheet of a cellulose triacetate film having an inner ring of adhesive adjacent to the center hole of the protector and an outer ring of adhesive adjacent to the outer circumference of the protector. The protector may be applied to either side of an optical disc. When applied to the data-read side of a disc, the rings of adhesive are so disposed that they do not obscure the data region of the disc. The disc protector is applied to the disc with the aid of a centering adapter that insures concentricity of the disc and protector.
Inventors
- 👤 Mutsuo Iijima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:43
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/0014; G11B23/0021; G11B23/02; G11B23/03; G11B23/0301; G11B23/0313; G11B33/00; G11B33/02; G11B33/04; G11B33/0405; G11B33/0411; G11B33/0422; G11B33/0427; G11B7/00; G11B7/24; G11B7/24097
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
94 words
In combination an optical disc having substantially flat opposing surfaces and a protective cover therefor comprising: a substantially transparent annular sheet having a top and bottom surface and an inner and an outer circumference; an inner ring of adhesive applied to said bottom surface adjacent to said inner circumference; and an outer ring of adhesive applied to said bottom surface adjacent to said outer circumference; said bottom surface, when said protective cover is applied to said optical disc, being substantially in contact with one of said substantially flat opposing surfaces of said optical disc.
Claim 2
Dependent Claim
94 words
In combination an optical disc having substantially flat opposing surfaces and a protective cover therefor comprising: a substantially transparent annular sheet having a top and bottom surface and an inner and an outer circumference; an inner ring of adhesive applied to said bottom surface adjacent to said inner circumference; and an outer ring of adhesive applied to said bottom surface adjacent to said outer circumference; said bottom surface, when said protective cover is applied to said optical disc, being substantially in contact with one of said substantially flat opposing surfaces of said optical disc.
Claim 3
Dependent Claim
111 words
A protective cover for an optical disc having substantially flat opposing surfaces comprising: a substantially transparent annular sheet having a top and bottom surface and an inner and an outer circumference; an inner ring of adhesive applied to said bottom surface adjacent to said inner circumference; and an outer ring of adhesive applied to said bottom surface adjacent to said outer circumference. said bottom surface, when said protective cover is applied to said optical disc, being substantially in contact with one of said substantially flat opposing surface of said optical disc, and further comprising a first peelable layer on said top surface and a second peelable layer on said bottom surface.
Claim 4
Dependent Claim
111 words
A protective cover for an optical disc having substantially flat opposing surfaces comprising: a substantially transparent annular sheet having a top and bottom surface and an inner and an outer circumference; an inner ring of adhesive applied to said bottom surface adjacent to said inner circumference; and an outer ring of adhesive applied to said bottom surface adjacent to said outer circumference. said bottom surface, when said protective cover is applied to said optical disc, being substantially in contact with one of said substantially flat opposing surface of said optical disc, and further comprising a first peelable layer on said top surface and a second peelable layer on said bottom surface.
Claim 5
Dependent Claim
32 words
The protective cover of claim 2 wherein at least one of said first and second peelable layers includes a tab portion extending beyond said outer circumference of said substantially transparent annular sheet.
Claim 6
Dependent Claim
27 words
The protective cover of claim 2 wherein said outer circumference of said substantially transparent annular sheet is approximately coincident with an outer circumference of the optical disc.
Claim 7
Dependent Claim
17 words
The protective cover of claim 2 wherein said substantially transparent annular sheet is made of cellulose triacetate.
Claim 8
Dependent Claim
19 words
The protective cover of claim 5 wherein said substantially transparent annular sheet has a thickness of approximately 0.125 mm.
References Cited (Backward Citations)
GB959076A
Cited
US3961656A
Cited
US4327830A
Cited
US4590493A
Cited
US4556968A
Cited
US4683562A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-06 | 1993-05-08 | 1993-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-06 | 1997-05-08 | 1997-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-06 | 2001-05-08 | 2001-11-07 | $7700.00 | Window Closed / Lapsed |