Patent US3125585A successfully refreshed from Google Patents.
US3125585A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of bicyclo-
Assignee: —
•
Filing: —
•
Granted: 1964-03-17
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Expires: 1981-03-17
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:41
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/52; C08G63/54; C08G63/553
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
30 words
THE PROCESS OF PREPARING BICYCLO-(2,2,2)-OCT-7-ENE2,6,5,6-TETRACARBOXYLIC ACID DIANHYDRIDE WHICH COMPRISES REACTING TWO MOLES OF MALEIC ANHYDRIDE WITH ONE MOLE OF TRANS 1-CHLOROBUTADIENE AT A TEMPERATURE OF ABOUT 200*C. TO ABOUT 220*C.
Claim 2
Dependent Claim
30 words
THE PROCESS OF PREPARING BICYCLO-(2,2,2)-OCT-7-ENE2,6,5,6-TETRACARBOXYLIC ACID DIANHYDRIDE WHICH COMPRISES REACTING TWO MOLES OF MALEIC ANHYDRIDE WITH ONE MOLE OF TRANS 1-CHLOROBUTADIENE AT A TEMPERATURE OF ABOUT 200*C. TO ABOUT 220*C.
References Cited (Backward Citations)
GB747970A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-03-17 | 1967-09-16 | 1968-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-17 | 1971-09-16 | 1972-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-17 | 1975-09-16 | 1976-03-17 | $7700.00 | Window Closed / Lapsed |