US2486881A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vertically adjustable attachment for bifocal spectacles
Assignee: Individual
•
Filing: 1947-05-19
•
Granted: 1949-11-01
•
Expires: 1967-05-19
Abstract
No abstract record available.
Inventors
- 👤 Roth Aaron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:07
CPC Classifications
G; G02; G02C; G02C5/00; G02C5/12; G02C5/122; G02C5/124
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US600496A
Cited
USRE20322E
Cited
US2057287A
Cited
US2057288A
Cited
US2326787A
Cited
US2446725A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-10-31 | 1953-05-02 | 1953-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-10-31 | 1957-05-02 | 1957-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-10-31 | 1961-05-02 | 1961-11-01 | $7700.00 | Window Closed / Lapsed |