US3503261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resistance to current converter
Assignee: Fischer and Porter Co
•
Filing: 1967-11-01
•
Granted: 1970-03-31
•
Expires: 1987-11-01
Abstract
No abstract record available.
Inventors
- 👤 Hubert A Riester
- 👤 Tamotsu Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:33
CPC Classifications
G; G01; G01P; G01P1/00; G01P1/07; G01P1/08; G01P1/10; G08; G08C; G08C19/00; G08C19/02; Y; Y10; Y10S; Y10S323/00; Y10S323/909
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2315127A
Cited
US2974303A
Cited
US3036464A
Cited
US3106645A
Cited
US3028756A
Cited
US3263092A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-30 | 1973-09-29 | 1974-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-30 | 1977-09-29 | 1978-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-30 | 1981-09-29 | 1982-03-31 | $7700.00 | Window Closed / Lapsed |