US2426367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable density recording optical system
Assignee: JA Maurer Inc
•
Filing: 1944-11-21
•
Granted: 1947-08-26
•
Expires: 1964-11-21
Abstract
No abstract record available.
Inventors
- 👤 Jr John A Maurer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:50
CPC Classifications
G; G11; G11B; G11B7/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1999721A
Cited
GB424042A
Cited
US2052220A
Cited
US2036622A
Cited
US2125890A
Cited
US2157166A
Cited
US2173681A
Cited
US2256402A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-08-25 | 1951-02-24 | 1951-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-08-25 | 1955-02-24 | 1955-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-08-25 | 1959-02-24 | 1959-08-26 | $7700.00 | Window Closed / Lapsed |