US3042639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic iron oxide coating compositions for recording tape
Assignee: Reeves Soundcraft Corp
•
Filing: 1956-06-11
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Granted: 1962-07-03
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Expires: 1976-06-11
Abstract
No abstract record available.
Inventors
- 👤 Adams Pierrepont
- 👤 Lawrence E Knees
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:53
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A COMPOSITION FOR FORMING A FLEXIBLE COATING ON SYNTHETIC RESIN FLEXIBLE TAPE BASES CONSISTING ESSENTIALLY OF A WATER INSOLUBLE, SYNETHIC ORGANIC FILM-FORMING RESIN SOLUTION, CAPABLE OF FORMING A FLEXIBLE FILM, ACICULAR GAMMA IRON OXIDE DISPERSED THERIN AND ABOUT 1-10 PERCENT BY WEIGHT OF AN AMINE SALT, BASED ON TOTAL SOLIDS, IN WHICH THE AMINE SALT IS AN N-ALKYL ALKYLENE DIAMINE IN WHICH THE ALKYL GROUPS RANGE IN SIZE FROM C8 TO C18 WITH THE AVERAGE ABOUT C12, AND THE ALKYLENE GROUPS AVERAGE 2-6 CARBON ATOMS, AND THE SALT FORMING ACID IS A HIGH MOLECULES WEIGHT ORGANIC ACID HAVING ABOUT 8 TO ABOUT 25 CARBON ATOMS.
Claim 2
Dependent Claim
105 words
A COMPOSITION FOR FORMING A FLEXIBLE COATING ON SYNTHETIC RESIN FLEXIBLE TAPE BASES CONSISTING ESSENTIALLY OF A WATER INSOLUBLE, SYNETHIC ORGANIC FILM-FORMING RESIN SOLUTION, CAPABLE OF FORMING A FLEXIBLE FILM, ACICULAR GAMMA IRON OXIDE DISPERSED THERIN AND ABOUT 1-10 PERCENT BY WEIGHT OF AN AMINE SALT, BASED ON TOTAL SOLIDS, IN WHICH THE AMINE SALT IS AN N-ALKYL ALKYLENE DIAMINE IN WHICH THE ALKYL GROUPS RANGE IN SIZE FROM C8 TO C18 WITH THE AVERAGE ABOUT C12, AND THE ALKYLENE GROUPS AVERAGE 2-6 CARBON ATOMS, AND THE SALT FORMING ACID IS A HIGH MOLECULES WEIGHT ORGANIC ACID HAVING ABOUT 8 TO ABOUT 25 CARBON ATOMS.
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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) | 1965-07-02 | 1966-01-01 | 1966-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-02 | 1970-01-01 | 1970-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-02 | 1974-01-01 | 1974-07-03 | $7700.00 | Window Closed / Lapsed |