US3778308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic storage device coating and process
Assignee: BAE Systems Space & Mission Systems Inc
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Filing: 1970-12-18
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Granted: 1973-12-11
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Expires: 1990-12-18
Abstract
Abstract THE MAGNETIC SURFACES OF MAGNETIC STORAGE DEVICES ARE PROTECTED AGAINST ABRASION AND FRICTION BY APPLYING A LUBRICATING COATING OF A PERFLUOROALKYL POLYETHER AND AN OPTIONAL THIN COATING OF A TRIFLUOROCHLOROETHYLENE COPOLYMER TO THE SURFACE THEREOF. THE PERFLUOROALKYL POLYETHERES EMPLOYED PREFERABLY HAVE A MOLECULAR WEIGHT OF AT LEAST 1000.
Inventors
- 👤 K Roller
- 👤 G Ahlborn
- 👤 R Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:06
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/72; G11B5/725; G11B5/7253; G11B5/7257; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |