Patent US901659A successfully refreshed from Google Patents.
US901659A
Expired / Lapsed
US
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Method of making bifocal lenses.
Assignee: Individual
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Filing: 1908-03-02
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Granted: 1908-10-20
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Expires: 1928-03-02
Abstract
No abstract record available.
Inventors
- 👤 Frederick A Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:31
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/20; C03B23/22
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) | 1911-10-20 | 1912-04-20 | 1912-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1915-10-20 | 1916-04-20 | 1916-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1919-10-20 | 1920-04-20 | 1920-10-20 | $7700.00 | Window Closed / Lapsed |