US2682559A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of hydroxybenzophenones
Assignee: GAF Chemicals Corp
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Filing: 1951-06-16
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Granted: 1954-06-29
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Expires: 1971-06-16
Abstract
No abstract record available.
Inventors
- 👤 Lester N Stanley
- 👤 Alois C Baggenstoss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:40
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/78; C07C45/81; C07C45/79; C07C45/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
16 words
THE PROCESS OF PURFYING HYDROXYBENZOPHENONES SELECTED FROM THE CLASS CONSISTING OF THOSE OF THE FOLLOWING FORMULAE:
Claim 2
Dependent Claim
16 words
THE PROCESS OF PURFYING HYDROXYBENZOPHENONES SELECTED FROM THE CLASS CONSISTING OF THOSE OF THE FOLLOWING FORMULAE:
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) | 1957-06-28 | 1957-12-28 | 1958-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-28 | 1961-12-28 | 1962-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-28 | 1965-12-28 | 1966-06-29 | $7700.00 | Window Closed / Lapsed |