Patent US4122942A successfully refreshed from Google Patents.
US3427480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric cleaning device
Assignee: SONOPTICS CORP
•
Filing: 1966-06-16
•
Granted: 1969-02-11
•
Expires: 1986-06-16
Abstract
No abstract record available.
Inventors
- 👤 Seymour D Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:15
CPC Classifications
A; A61; A61C; A61C17/00; A61C17/16; A61C17/20; H; H02; H02K; H02K33/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2573168A
Cited
US2947082A
Cited
US2874470A
Cited
US2834158A
Cited
US2831295A
Cited
US3076904A
Cited
US3328610A
Cited
US3350582A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-11 | 1972-08-12 | 1973-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-11 | 1976-08-12 | 1977-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-11 | 1980-08-12 | 1981-02-11 | $7700.00 | Window Closed / Lapsed |