US3336340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Benzopyrans and process for the preparation thereof
Assignee: Rohm and Haas Co
•
Filing: 1963-11-29
•
Granted: 1967-08-15
•
Expires: 1983-11-29
Abstract
No abstract record available.
Inventors
- 👤 Louis R Freimiller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:44
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/15; C08K5/151; C08K5/1545; C07; C07D; C07D311/00; C07D311/02; C07D311/78; C07D311/80; C07D311/96
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
5 words
A COMPOUND OF THE STRUCTURE
Claim 2
Dependent Claim
5 words
A COMPOUND OF THE STRUCTURE
Claim 3
Dependent Claim
5 words
A COMPOUND OF THE STRUCTURE
Claim 4
Dependent Claim
5 words
A COMPOUND OF THE STRUCTURE
References Cited (Backward Citations)
US2419935A
Cited
US2509385A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-08-14 | 1971-02-13 | 1971-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-14 | 1975-02-13 | 1975-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-14 | 1979-02-13 | 1979-08-15 | $7700.00 | Window Closed / Lapsed |