US2875402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trace brightening circuit
Assignee: HEYER IND Inc
•
Filing: 1956-11-09
•
Granted: 1959-02-24
•
Expires: 1976-11-09
Abstract
No abstract record available.
Inventors
- 👤 John John H St
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:19
CPC Classifications
H; H01; H01G; H01G2/00; F; F02; F02P; F02P17/00; F02P17/02; H05; H05K; H05K1/00; H05K1/02; H05K1/14; H05K1/141; H05K1/18; H05K1/182; H05K1/184; H05K2201/00; H05K2201/09; H05K2201/09145; H05K2201/09172; H05K2201/10; H05K2201/10431; H05K2201/10439; H05K2201/10446; H05K2201/10507; H05K2201/1053; H05K2201/10613; H05K2201/10621; H05K2201/10643; H05K3/00; H05K3/30; H05K3/32; H05K3/34; H05K3/3405; H05K3/36; H05K3/366
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-23 | 1962-08-25 | 1963-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-23 | 1966-08-25 | 1967-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-23 | 1970-08-25 | 1971-02-24 | $7700.00 | Window Closed / Lapsed |