Patent US3420604A successfully refreshed from Google Patents.
US3420604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound film apparatus
Assignee: ARTHUR W KINGSTON
•
Filing: 1965-07-23
•
Granted: 1969-01-07
•
Expires: 1985-07-23
Abstract
No abstract record available.
Inventors
- 👤 Arthur W Kingston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:49
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/32; G03B1/00; G03B1/18; G03B1/20; G03B1/22; G03B21/321; G03B21/323; G11; G11B; G11B15/00; G11B15/18; G11B15/26; G11B15/34
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US940275A
Cited
US1210323A
Cited
FR33496E
Cited
US2095831A
Cited
US2625073A
Cited
US3022707A
Cited
US2988954A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |