Patent US2528417A successfully refreshed from Google Patents.
US2528417A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Epoxy ether compositions containing phenolic pitch
Assignee: Shell Development Co
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Filing: 1949-01-25
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Granted: 1950-10-31
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Expires: 1969-01-25
Abstract
No abstract record available.
Inventors
- 👤 Theodore F Bradley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:38
CPC Classifications
C; C08; C08L; C08L63/00; Y; Y10; Y10S; Y10S425/00; Y10S425/012
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
A COMPOSITION OF MATTER COMPRISING AN EPOXY ETHER HAVING A 1,2-EPOXY EQUIVALENCY GREATER THAN 1, AND IN ADMIXTURE THEREWITH AN APPRECIABLE PROPORTION OF PHENOLIC PITCH CONSISTING OF A SEMI-SOLID AQUEOUS ALKALI EXTRACT OF CRACKED PETROLEUM.
Claim 2
Dependent Claim
35 words
A COMPOSITION OF MATTER COMPRISING AN EPOXY ETHER HAVING A 1,2-EPOXY EQUIVALENCY GREATER THAN 1, AND IN ADMIXTURE THEREWITH AN APPRECIABLE PROPORTION OF PHENOLIC PITCH CONSISTING OF A SEMI-SOLID AQUEOUS ALKALI EXTRACT OF CRACKED PETROLEUM.
References Cited (Backward Citations)
US2203217A
Cited
US2324483A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-30 | 1954-05-01 | 1954-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-30 | 1958-05-01 | 1958-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-30 | 1962-05-01 | 1962-10-31 | $7700.00 | Window Closed / Lapsed |