US3528926A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixed photochromic compound composition
Assignee: Appvion LLC
•
Filing: 1966-10-27
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Granted: 1970-09-15
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Expires: 1986-10-27
Abstract
No abstract record available.
Inventors
- 👤 John J Van Voorhis
- 👤 Carol A Stowe Van Voorhis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:41
CPC Classifications
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)
US3100778A
Cited
US3231584A
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US3085469A
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US3269267A
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US3290331A
Cited
US3359103A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-14 | 1974-03-16 | 1974-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-14 | 1978-03-16 | 1978-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-14 | 1982-03-16 | 1982-09-15 | $7700.00 | Window Closed / Lapsed |