US3504972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exposure adjusting apparatus for a duplicator
Assignee: Ricoh Co Ltd
•
Filing: 1967-09-28
•
Granted: 1970-04-07
•
Expires: 1987-09-28
Abstract
No abstract record available.
Inventors
- 👤 Shigeru Suzuki
- 👤 Yutaka Koizumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:01
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/522; G03B27/525; G03B27/526; G03B27/527; G03B27/72
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2153186A
Cited
US3364816A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-06 | 1973-10-06 | 1974-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-06 | 1977-10-06 | 1978-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-06 | 1981-10-06 | 1982-04-07 | $7700.00 | Window Closed / Lapsed |