US3427191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording tape
Assignee: Millennium Petrochemicals Inc
•
Filing: 1965-03-03
•
Granted: 1969-02-11
•
Expires: 1985-03-03
Abstract
No abstract record available.
Inventors
- 👤 Samuel G Howell
- 👤 Dale M Akers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:59
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; G11B5/7023; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/25; Y10T428/254
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB676761A
Cited
US2628172A
Cited
GB731940A
Cited
US2931740A
Cited
US2932323A
Cited
US3117092A
Cited
GB951867A
Cited
US3243376A
Cited
US3310421A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-11 | 1972-08-12 | 1973-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-11 | 1976-08-12 | 1977-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-11 | 1980-08-12 | 1981-02-11 | $7700.00 | Window Closed / Lapsed |