US3453529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Attenuators having constant output resistance
Assignee: Weston Instruments Inc
•
Filing: 1967-02-17
•
Granted: 1969-07-01
•
Expires: 1987-02-17
Abstract
No abstract record available.
Inventors
- 👤 Peter L Richman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:53
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/24
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1195660A
Cited
US1912719A
Cited
US2119195A
Cited
US2184104A
Cited
US2536501A
Cited
US2951200A
Cited
US2862176A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-30 | 1972-12-30 | 1973-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-30 | 1976-12-30 | 1977-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-30 | 1980-12-30 | 1981-07-01 | $7700.00 | Window Closed / Lapsed |