US2907834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic reproducing head
Assignee: US Philips Corp
•
Filing: 1955-10-12
•
Granted: 1959-10-06
•
Expires: 1975-10-12
Abstract
No abstract record available.
Inventors
- 👤 Duinker Simon
- 👤 Westmijze Willem Klaas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:52
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/37
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1778795A
Cited
US2464807A
Cited
US2768243A
Cited
GB705248A
Cited
US2736822A
Cited
US2714182A
Cited
US2866013A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-05 | 1963-04-06 | 1963-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-05 | 1967-04-06 | 1967-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-05 | 1971-04-06 | 1971-10-06 | $7700.00 | Window Closed / Lapsed |