US3413320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High purity diepoxide
Assignee: Shell USA Inc
•
Filing: 1960-03-14
•
Granted: 1968-11-26
•
Expires: 1980-03-14
Abstract
No abstract record available.
Inventors
- 👤 Kenneth B Cofer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:40
CPC Classifications
C; C07; C07D; C07D303/00; C07D303/02; C07D303/12; C07D303/18; C07D303/20; C07D303/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
8 words
AS A MANUFACTURE, FREE-FLOWING CRYSTALS OF 2,2-BIS(2,3-EPOXYPROPOXYPHENYL) PROPANE.
Claim 2
Dependent Claim
8 words
AS A MANUFACTURE, FREE-FLOWING CRYSTALS OF 2,2-BIS(2,3-EPOXYPROPOXYPHENYL) PROPANE.
References Cited (Backward Citations)
US2467171A
Cited
CA565590A
Cited
US2506486A
Cited
US2530353A
Cited
US2682547A
Cited
US2765322A
Cited
US3095429A
Cited
US3142688A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-26 | 1972-05-27 | 1972-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-26 | 1976-05-27 | 1976-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-26 | 1980-05-27 | 1980-11-26 | $7700.00 | Window Closed / Lapsed |