Patent US4853262A successfully refreshed from Google Patents.
US4853262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cover film for microscopy
Assignee: Fujifilm Holdings Corp
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Filing: 1986-08-11
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Granted: 1989-08-01
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Expires: 2006-08-11
Abstract
Abstract A cover film for use in microscopy which has an excellent adhesion with a slide glass and does not cause blocking during storage is obtained by coating a solution of a polymer adhesive having a glass transition temperature of at least 50° C. in an organic solvent on a transparent substrate and evaporating the organic solvent.
Inventors
- 👤 Ikutaro Horie
- 👤 Masashi Ishiyama
- 👤 Teiichi Tomizuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:00
CPC Classifications
C; C09; C09J; C09J133/00; C09J133/04; C09J133/06; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C08J7/046; G; G01; G01N; G01N1/00; G01N1/28; G01N1/36; G02; G02B; G02B21/00; G02B21/34; C08J2433/00; C08L; C08L2205/00; C08L2205/02; C08L2666/00; C08L2666/02; C08L2666/04; C08L33/00; C08L33/04; C08L33/06; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
132 words
A cover film for use in microscopy, which comprises a transparent plastic substrate having provided thereon a layer of a polymer adhesive which is a blend of a first polymer adhesive and second polymer adhesive which are different and which are both selected from the group consisting of an acrylic adhesive and an acrylic copolymer of alkyl methacrylate and alkyl acrylate, said first polymer adhesive having a glass transition temperature of at least 80° C. and said second polymer adhesive having a glass transition temperature of 50° C. to less than 80° C. with the weight ratio of the first adhesive to the second adhesive being 7:3 to 5:5 and said polymer adhesive being soluble in any one of xylene, toluene, ethyl acetate, methyl acetate, acetone, methyl ethyl ketone or mixtures thereof.
Claim 2
Dependent Claim
132 words
A cover film for use in microscopy, which comprises a transparent plastic substrate having provided thereon a layer of a polymer adhesive which is a blend of a first polymer adhesive and second polymer adhesive which are different and which are both selected from the group consisting of an acrylic adhesive and an acrylic copolymer of alkyl methacrylate and alkyl acrylate, said first polymer adhesive having a glass transition temperature of at least 80° C. and said second polymer adhesive having a glass transition temperature of 50° C. to less than 80° C. with the weight ratio of the first adhesive to the second adhesive being 7:3 to 5:5 and said polymer adhesive being soluble in any one of xylene, toluene, ethyl acetate, methyl acetate, acetone, methyl ethyl ketone or mixtures thereof.
Claim 3
Dependent Claim
18 words
The cover film of claim 1, wherein said polymer adhesive has a refractive index of at least 1.45.
Claim 4
Dependent Claim
18 words
The cover film of claim 2, wherein said polymer adhesive has a refractive index of at least 1.47.
Claim 5
Dependent Claim
23 words
The cover film of claim 1, wherein said polymer adhesive is coated in an amount of 1 to 50 g/m 2 after drying.
Claim 6
Dependent Claim
23 words
The cover film of claim 4, wherein said polymer adhesive is coated in an amount of 7 to 25 g/m 2 after drying.
Claim 7
Dependent Claim
17 words
The cover film of claim 1, wherein said first and second polymer adhesives are acrylic polymer adhesives.
Claim 8
Dependent Claim
16 words
The cover film of claim 1, wherein a protective layer is provided on said adhesive layer.
Claim 9
Dependent Claim
19 words
The cover film of claim 1, wherein a backing layer is provided on the reverse side of the substrate.
Claim 10
Dependent Claim
24 words
The cover film of claim 1, wherein said substrate is selected from the group consisting of cellulose triacetate, cellulose diacetate and polyethylene terephthalate films.
Claim 11
Dependent Claim
16 words
The cover film of claim 1, wherein said substrate has thickness of 50 to 250 microns.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-31 | 1993-01-30 | 1993-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-31 | 1997-01-30 | 1997-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-31 | 2001-01-30 | 2001-08-01 | $7700.00 | Window Closed / Lapsed |