US4570197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Static reduction in magnetic recording cassettes
Assignee: 3M Co
•
Filing: 1983-01-03
•
Granted: 1986-02-11
•
Expires: 2003-01-03
Abstract
Abstract The provision of non-volatile, electrically conductive organic coatings to the surfaces of cassettes housing magnetic recording tape substantially reduces triboelectric charging.
Inventors
- 👤 John D. Hakanson
- 👤 Gerald J. Niles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:31
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/16; G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; Y; Y10; Y10S; Y10S242/00; Y10S242/906; Y10S428/00; Y10S428/90; Y10S428/922; Y10T; Y10T428/00; Y10T428/31504
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
46 words
An organic polymeric resin cassette for the housing of electromagnetic recording tape characterized by the fact that at least one major surface of the cassette has a coating of between 0.5 to 250 micrograms per square inch of a non-integral non-volatile, electrically conductive, organic composition thereon.
Claim 2
Dependent Claim
46 words
An organic polymeric resin cassette for the housing of electromagnetic recording tape characterized by the fact that at least one major surface of the cassette has a coating of between 0.5 to 250 micrograms per square inch of a non-integral non-volatile, electrically conductive, organic composition thereon.
Claim 3
Dependent Claim
14 words
The cassette of claim 1 wherein electromagnetic recording tape is present within said cassette.
Claim 4
Dependent Claim
15 words
The cassette of claim 2 wherein said tape is one-half inch audio-video electromagnetic recording tape.
Claim 5
Dependent Claim
15 words
The cassette of claim 2 wherein said tape is eight millimeter audio-video electromagnetic recording tape.
Claim 6
Dependent Claim
15 words
The cassette of claim 2 wherein said tape is 3.8 millimeter audio electromagnetic recording tape.
Claim 7
Dependent Claim
29 words
The cassette of claim 1 wherein at least twenty-five percent of all interior and exterior surfaces of the cassette are coated with said composition and said composition is non-integral.
Claim 8
Dependent Claim
29 words
The cassette of claim 1 wherein at least seventy-five percent of all interior and exterior surfaces of the cassette are coated with said composition and said composition is non-integral.
Claim 9
Dependent Claim
24 words
The cassette of claim 2 wherein at least seventy-five percent of all interior and exterior surfaces of the cassette are coated with said composition.
Claim 10
Dependent Claim
24 words
The cassette of claim 3 wherein at least seventy-five percent of all interior and exterior surfaces of the cassette are coated with said composition.
Claim 11
Dependent Claim
20 words
The cassette of claim 1 wherein substantially all interior and exterior surfaces of the cassette are coated with said composition
Claim 12
Dependent Claim
20 words
The cassette of claim 2 wherein substantially all interior and exterior surfaces of the cassette are coated with said composition.
Claim 13
Dependent Claim
20 words
The cassette of claim 3 wherein substantially all interior and exterior surfaces of the cassette are coated with said composition.
Claim 14
Dependent Claim
46 words
The cassette of claim 1 wherein said composition is present in an amount between 0.5 and 250 micrograms per square inch and comprises a material which is selected antistatic compositions from the group consisting of (a) quaternary amines, (b) quaternary phosphines, and (c) perfluorinated ionic compounds.
Claim 15
Dependent Claim
46 words
The cassette of claim 2 wherein said composition is present in an amount between 0.5 and 250 micrograms per square inch and comprises a material which is selected antistatic compositions from the group consisting of (a) quaternary amines, (b) quaternary phosphines, and (c) perfluorinated ionic compounds.
Claim 16
Dependent Claim
46 words
The cassette of claim 3 wherein said compositon is present in an amount between 0.5 and 250 micrograms per square inch and comprises a material which is selected antistatic compositions from the group consisting of (a) quaternary amines, (b) quaternary phosphines, and (c) perfluorinated ionic compounds.
Claim 17
Dependent Claim
38 words
The cassette of claim 1 wherein said composition comprises a fluorinated anionic surfactant which is an amine salt of an acid containing a fluorinated organic radical and an antistatic agent which is an ionic salt of an amine.
Claim 18
Dependent Claim
38 words
The cassette of claim 2 wherein said composition comprises a fluorinated anionic surfactant which is an amine salt of an acid containing a fluorinated organic radical and an antistatic agent which is an ionic salt of an amine.
Claim 19
Dependent Claim
38 words
The cassette of claim 3 wherein said composition comprises a fluorinated anionic surfactant which is an amine salt of an acid containing a fluorinated organic radical and an antistatic agent which is an ionic salt of an amine.
Claim 20
Dependent Claim
58 words
The cassette of claim 17 wherein at least seventy-five percent of all interior and exterior surfaces of the cassette are coated with said composition in an amount between 1 and 100 micrograms per square inch and the anion molar percent of the fluorinated organic radical is between 1.8 and 42.9 percent of the mixture of the two ingredients.
Claim 21
Dependent Claim
58 words
The cassette of claim 18 wherein at least seventy-five percent of all interior and exterior surfaces of the cassette are coated with said composition in an amount between 1 and 100 micrograms per square inch and the anion molar percent of the fluorinated organic radical is between 1.8 and 42.9 percent of the mixture of the two ingredients.
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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) | 1989-02-10 | 1989-08-12 | 1990-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-10 | 1993-08-12 | 1994-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-10 | 1997-08-12 | 1998-02-11 | $7700.00 | Window Closed / Lapsed |