US3420666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-component heat developing diazotypes
Assignee: GAF Corp
•
Filing: 1964-10-15
•
Granted: 1969-01-07
•
Expires: 1984-10-15
Abstract
No abstract record available.
Inventors
- 👤 Walter J Welch
- 👤 Bert E Tripp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:14
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA454396A
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CA549023A
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US2657137A
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US2653091A
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GB788282A
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GB825361A
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GB849739A
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US3155511A
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US3159487A
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US3316092A
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US3166422A
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US3298834A
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US3321310A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |