Patent US3142657A successfully refreshed from Google Patents.
US3142657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elastic reaction product of a polyepoxide, a glycol, and an acid anhydride
Assignee: BASF Schweiz AG
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Filing: 1957-10-18
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Granted: 1964-07-28
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Expires: 1977-10-18
Abstract
No abstract record available.
Inventors
- 👤 Fisch Willy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:58
CPC Classifications
C; C08; C08L; C08L63/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
68 words
AN ELASTIC INFUSIBLE PRODUCT, WHICH CONSISTS ESSENTIALLY OF THE REACTION PRODUCT OF A COMPOUND CONTAINING MORE THAN ONE 1,2-EPOXIDE GROUP PER MOL WITH, AS CROSSLINKING AGENT, A MIXTURE OF A POLYALKYLENE GLYCOL HAVING AN AVERAGE MOLECULAR WEIGHT OF ABOUT 200 TO ABOUT 750 CONTAINING TWO TERMINAL HYDROXYL GROUPS, WHICH ARE SEPARATED FROM ONE ANOTHER BY A CHAIN OF AT LEAST 14 MEMBERS SELECTED FROM THE CLASS CONSISTING OF
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) | 1967-07-28 | 1968-01-27 | 1968-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-28 | 1972-01-27 | 1972-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-28 | 1976-01-27 | 1976-07-28 | $7700.00 | Window Closed / Lapsed |