Patent US6092512A successfully refreshed from Google Patents.
Patent US2601888A successfully refreshed from Google Patents.
US3106567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making 2, 2'-biphenyl lactone
Assignee: United States Steel Corp
•
Filing: 1961-04-05
•
Granted: 1963-10-08
•
Expires: 1981-04-05
Abstract
No abstract record available.
Inventors
- 👤 John O Hawthorne
- 👤 Edward L Mihelic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:00
CPC Classifications
C; C07; C07D; C07D311/00; C07D311/02; C07D311/78; C07D311/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
A METHOD OF MAKING 2,2''-BIPHENYL LACTONE, COMPRISING FORMING AN AQUEOUS SOLUTION OF 2,2''-DIPHENIC ACID, ADDING HYDROGEN PEROXIDE TO THE SOLUTION AND HEATING IT THEREBY CAUSING THE LACTONE TO APPEAR AS AN OIL, AND COLLECTING THE LACTONE THUS FORMED.
Claim 2
Independent Claim
38 words
A METHOD OF MAKING 2,2''-BIPHENYL LACTONE, COMPRISING FORMING AN AQUEOUS SOLUTION OF 2,2''-DIPHENIC ACID, ADDING HYDROGEN PEROXIDE TO THE SOLUTION AND HEATING IT THEREBY CAUSING THE LACTONE TO APPEAR AS AN OIL, AND COLLECTING THE LACTONE THUS FORMED.
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) | 1966-10-07 | 1967-04-08 | 1967-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-10-07 | 1971-04-08 | 1971-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-10-07 | 1975-04-08 | 1975-10-08 | $7700.00 | Window Closed / Lapsed |