Patent US3418161A successfully refreshed from Google Patents.
US3418161A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing a magnetic recording element
Assignee: RCA Corp
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Filing: 1963-09-18
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Granted: 1968-12-24
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Expires: 1983-09-18
Abstract
No abstract record available.
Inventors
- 👤 Bauer Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:19
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; G11B5/7021; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A METHOD FOR PREPARING A MAGNETIC RECORDING ELEMENT COMPRISING (1) TREATING MAGNETIC PARTICLES BY CONTACTING SAID PARTICLES WITH A REACTIVE ISOCYANATE COMPOUND SELECTED FROM THE GROUP CONSISTING OF AROMATIC AND ALIPHATIC ISOCYANATES, (2) PREPARING A DISPERSION OF SAID TREATED PARTICLES IN A NONAQUEOUS MEDIUM, CONTAINING AN ISOCYANATETERMINATED PREPOLYMER, (3) ADDING TO SAID DISPERSION A NONPOLYMERIC BIFUNCTIONAL COMPOUND HAVING AT LEST TWO HYDROGEN ATOMS WHICH ARE CAPABLE OF REACTING WITH ISOCYANATE GROUPS, SAID BIFUNCTIONAL COMPOUND BEING ADDED IN AN AMOUNT INSUFFICIENT TO REACT WITH ALL OF THE FREE ISOCYANATE GROUPS IN SAID PREPOLYMER TO PRODUCE A COATING MIXUTRE, (4) COATING A BASE WITH SAID COATING MIXTURE, (5) AND THEN CURING SAID COATING.
Claim 2
Independent Claim
111 words
A METHOD FOR PREPARING A MAGNETIC RECORDING ELEMENT COMPRISING (1) TREATING MAGNETIC PARTICLES BY CONTACTING SAID PARTICLES WITH A REACTIVE ISOCYANATE COMPOUND SELECTED FROM THE GROUP CONSISTING OF AROMATIC AND ALIPHATIC ISOCYANATES, (2) PREPARING A DISPERSION OF SAID TREATED PARTICLES IN A NONAQUEOUS MEDIUM, CONTAINING AN ISOCYANATETERMINATED PREPOLYMER, (3) ADDING TO SAID DISPERSION A NONPOLYMERIC BIFUNCTIONAL COMPOUND HAVING AT LEST TWO HYDROGEN ATOMS WHICH ARE CAPABLE OF REACTING WITH ISOCYANATE GROUPS, SAID BIFUNCTIONAL COMPOUND BEING ADDED IN AN AMOUNT INSUFFICIENT TO REACT WITH ALL OF THE FREE ISOCYANATE GROUPS IN SAID PREPOLYMER TO PRODUCE A COATING MIXUTRE, (4) COATING A BASE WITH SAID COATING MIXTURE, (5) AND THEN CURING SAID COATING.
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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) | 1971-12-24 | 1972-06-24 | 1972-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-24 | 1976-06-24 | 1976-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-24 | 1980-06-24 | 1980-12-24 | $7700.00 | Window Closed / Lapsed |