US738887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ophthalmoscope.
Assignee: A M DE ZENG
•
Filing: 1901-06-03
•
Granted: 1903-09-15
•
Expires: 1921-06-03
Abstract
No abstract record available.
Inventors
- 👤 Henry L De Zeng
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:43
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/103; Y; Y10; Y10S; Y10S362/00; Y10S362/804
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1906-09-14 | 1907-03-16 | 1907-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1910-09-14 | 1911-03-16 | 1911-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1914-09-14 | 1915-03-16 | 1915-09-15 | $7700.00 | Window Closed / Lapsed |