Patent US3449648A successfully refreshed from Google Patents.
US3449648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Igfet with interdigital source and drain and gate with limited overlap
Assignee: US Philips Corp
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Filing: 1967-02-20
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Granted: 1969-06-10
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Expires: 1987-02-20
Abstract
No abstract record available.
Inventors
- 👤 Julian Robert Anthony Beale
- 👤 Andrew Francis Beer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:59
CPC Classifications
H; H10; H10W; H10W74/00; H10W74/40; H10W74/43; H10D; H10D99/00; H10W20/00; H10W20/40; H10W20/482; H10W20/484
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3097308A
Cited
US3094633A
Cited
US3303400A
Cited
US3258663A
Cited
US3121177A
Cited
US3309585A
Cited
US3354354A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-09 | 1972-12-09 | 1973-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-09 | 1976-12-09 | 1977-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-09 | 1980-12-09 | 1981-06-10 | $7700.00 | Window Closed / Lapsed |