US2978462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Derivatives of 3'-methyl-spiro (2h-1-beta-naphthopyran-2', 2'-[2'h-1' benzopyran])
Assignee: NCR Voyix Corp
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Filing: 1959-06-19
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Granted: 1961-04-04
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Expires: 1979-06-19
Abstract
No abstract record available.
Inventors
- 👤 Berman Elliot
- 👤 David B Mcquain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:52
CPC Classifications
C; C07; C07D; C07D493/00; C07D493/02; C07D493/10; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/6561; G; G03; G03C; G03C1/00; G03C1/685
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) | 1964-04-03 | 1964-10-03 | 1965-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-03 | 1968-10-03 | 1969-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-03 | 1972-10-03 | 1973-04-04 | $7700.00 | Window Closed / Lapsed |