US3515587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for changing the optical characteristics of an article
Assignee: Bausch and Lomb Inc
•
Filing: 1968-12-27
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Granted: 1970-06-02
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Expires: 1988-12-27
Abstract
No abstract record available.
Inventors
- 👤 Eugene C Letter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:34
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/34; C03C17/36; C03C17/3602; C03C17/3605; C03C17/3642; C03C17/3657; C03C23/00; C03C23/0005; C03C23/004; C03C23/006; C08; C08L; C08L67/00; C08L67/04; D; D01; D01F; D01F6/00; D01F6/78; D01F6/84
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-01 | 1973-12-01 | 1974-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-01 | 1977-12-01 | 1978-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-01 | 1981-12-01 | 1982-06-02 | $7700.00 | Window Closed / Lapsed |