US3407145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photochromic means and methods
Assignee: Compagnie de Saint Gobain SA
•
Filing: 1965-02-18
•
Granted: 1968-10-22
•
Expires: 1985-02-18
Abstract
No abstract record available.
Inventors
- 👤 Brule Daniel Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:25
CPC Classifications
C; C07; C07D; C07D471/00; C07D471/12; C07D471/20; C03; C03C; C03C17/00; C03C17/28; G; G02; G02B; G02B5/00; G02B5/20; G02B5/22; G02B5/23; G03; G03C; G03C1/00; G03C1/685; Y; Y10; Y10S; Y10S430/00; Y10S430/163
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3085469A
Cited
US3278449A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-22 | 1972-04-22 | 1972-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-22 | 1976-04-22 | 1976-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-22 | 1980-04-22 | 1980-10-22 | $7700.00 | Window Closed / Lapsed |