Patent US3503331A successfully refreshed from Google Patents.
US3503331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled current flow electrostatic printing
Assignee: Purex Corp Ltd
•
Filing: 1968-08-23
•
Granted: 1970-03-31
•
Expires: 1988-08-23
Abstract
No abstract record available.
Inventors
- 👤 William T Fisher
- 👤 Robert D Thompson
- 👤 Charles B Patterson
- 👤 Stanley M Dahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:48
CPC Classifications
B; B41; B41M; B41M1/00; B41M1/12; B41M1/125; Y; Y10; Y10S; Y10S101/00; Y10S101/37
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) | 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 |