US5213887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antistatic coatings
Assignee: 3M Co
•
Filing: 1991-09-03
•
Granted: 1993-05-25
•
Expires: 2011-09-03
Abstract
Abstract A bilayer coating of layers of inorganic metal oxide sol and a layer of a chitosan salt provides improved antistatic properties over a polymeric film substrate.
Inventors
- 👤 William A. Huffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:41
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/85; G03C1/89; C; C09; C09D; C09D105/00; C09D105/08; C09K; C09K3/00; C09K3/16; G03C1/853; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/257; Y10T428/259; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/31504; Y10T428/31786; Y10T428/31855; Y10T428/31971
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
29 words
A substrate having an antistatic protective coating thereon, said coating comprising an optically, transparent layer of chitosan acid salt over a layer of anionic inorganic metal oxide colloidal particles.
Claim 2
Dependent Claim
29 words
A substrate having an antistatic protective coating thereon, said coating comprising an optically, transparent layer of chitosan acid salt over a layer of anionic inorganic metal oxide colloidal particles.
Claim 3
Dependent Claim
12 words
The substrate of claim 1 wherein said substrate comprises organic polymeric material.
Claim 4
Dependent Claim
30 words
The substrate of claim 2 wherein said organic polymeric material is in the form of a sheet or film and said antistatic coating has a thickness of from 25-2000 nm.
Claim 5
Dependent Claim
13 words
The substrate of claim 3 wherein said chitosan acid salt has been alkylated.
Claim 6
Dependent Claim
16 words
The substrate of claim 4 wherein said alkylated chitosan acid salt has been methylated or ethylated.
Claim 7
Dependent Claim
20 words
The substrate of claim 2 wherein said inorganic metal oxide colloidal particles comprise silica, titania, stannic oxide or mixtures thereof.
Claim 8
Dependent Claim
20 words
The substrate of claim 3 wherein said inorganic metal oxide colloidal particles comprise silica, titania, stannic oxide or mixtures thereof.
Claim 9
Dependent Claim
20 words
The substrate of claim 5 wherein said inorganic metal oxide colloidal particles comprise silica, titania, stannic oxide or mixtures thereof.
Claim 10
Dependent Claim
51 words
An organic polymeric film having on at least one surface thereof an optically transparent antistatic protection layer comprising a first layer of a chitosan acid salt and a second layer of anionic inorganic metal oxide colloidal particles, said layer of colloidal particles being between said film and said first top layer.
Claim 11
Dependent Claim
51 words
An organic polymeric film having on at least one surface thereof an optically transparent antistatic protection layer comprising a first layer of a chitosan acid salt and a second layer of anionic inorganic metal oxide colloidal particles, said layer of colloidal particles being between said film and said first top layer.
Claim 12
Dependent Claim
17 words
The film of claim 9 wherein both sides of said film have said antistatic protection layer thereon.
Claim 13
Dependent Claim
47 words
A substrate having an antistatic protective coating thereon, said coating comprising an optically transparent layer of chitosan acid salt over a layer of inorganic metal oxide colloidal particles which is adhered to said substrate, the acid of said acid salt having a pH of less than 5.0.
Claim 14
Dependent Claim
47 words
A substrate having an antistatic protective coating thereon, said coating comprising an optically transparent layer of chitosan acid salt over a layer of inorganic metal oxide colloidal particles which is adhered to said substrate, the acid of said acid salt having a pH of less than 5.0.
Claim 15
Dependent Claim
59 words
An organic polymeric film having on at least one surface thereof an optically transparent antistatic protection layer comprising a first layer of a chitosan acid salt over a layer of anionic inorganic metal oxide colloidal particles, said layer of particles being adhered to said film, and the acid of said acid salt having a pH of less than 5.0.
Claim 16
Dependent Claim
59 words
An organic polymeric film having on at least one surface thereof an optically transparent antistatic protection layer comprising a first layer of a chitosan acid salt over a layer of anionic inorganic metal oxide colloidal particles, said layer of particles being adhered to said film, and the acid of said acid salt having a pH of less than 5.0.
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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) | 1996-05-24 | 1996-11-23 | 1997-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-24 | 2000-11-23 | 2001-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-24 | 2004-11-23 | 2005-05-25 | $7700.00 | Window Closed / Lapsed |