US2804401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic sound tape
Assignee: Individual
•
Filing: 1955-04-11
•
Granted: 1957-08-27
•
Expires: 1975-04-11
Abstract
No abstract record available.
Inventors
- 👤 Bernard A Cousino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:58
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/71; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/25; Y10T428/30; Y10T428/31504; Y10T428/31786; Y10T428/31971
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
58 words
A METHOD OF TREATING A MAGNETIC RECORDING TAPE HAVING A CONTINUOUS FILM OF SYNTHETIC PLASTIC WITH A SMOOTH MAGNETIC SURFACE WHICH COMPRISES PROVIDING A VOLATILE LIQUID CARRIER HAVING MINUTELY DIVIDED GRAPHITE PARTICLESA DISPERSED THEREIN, APPLYING SAID CARRIER TO AT LEAST ONE FACE OF SAID TAPE, AND DRYING SAID TAPE TO LEAVE A COATING OF GRAPHITE ON SAID FACE.
References Cited (Backward Citations)
US2003564A
Cited
US2426838A
Cited
US2607710A
Cited
US2697671A
Cited
US2749490A
Cited
US2702580A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-26 | 1961-02-25 | 1961-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-26 | 1965-02-25 | 1965-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-26 | 1969-02-25 | 1969-08-27 | $7700.00 | Window Closed / Lapsed |