Patent US2849452A successfully refreshed from Google Patents.
US2849452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidation products of 6-substituted-2, 2, 4-trialkyl dihydroquinolines
Assignee: Bridgestone Firestone Inc
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Filing: 1955-07-29
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Granted: 1958-08-26
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Expires: 1975-07-29
Abstract
No abstract record available.
Inventors
- 👤 Frederick J Webb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:07
CPC Classifications
C; C07; C07D; C07D215/00; C07D215/58; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3442; C08K5/3462; C08K5/3465
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
3 words
AS NEW COMPOUND:
Claim 2
Dependent Claim
3 words
AS NEW COMPOUND:
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) | 1961-08-25 | 1962-02-24 | 1962-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-25 | 1966-02-24 | 1966-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-25 | 1970-02-24 | 1970-08-26 | $7700.00 | Window Closed / Lapsed |