Patent US2970987A successfully refreshed from Google Patents.
US2970987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymer having amide and urethane linkages
Assignee: EIDP Inc
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Filing: 1957-05-08
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Granted: 1961-02-07
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Expires: 1977-05-08
Abstract
No abstract record available.
Inventors
- 👤 Emerson L Wittbecker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:42
CPC Classifications
C; C08; C08G; C08G69/00; C08L; C08L75/00; Y; Y10; Y10S; Y10S260/00; Y10S260/15; Y10S260/17
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
A HIGH MOLECULAR WEIGHT AND HIGH MELTING POINT COPOLYMER CONTAINING AMIDE AND URETHANE LINKAGES AND COMPOSED OF UNITS OF THE STRUCTURE FIG -01 WHEREIN THE PARENTHETICAL SUBSCRIPTS REPRESENT THE MOLAR PERCENTAGE AND RANGES OF PERMISSIBLE MOLAR PERCENTAGES OF EACH UNIT IN THE FINAL PRODUCT, Z BEING A DIVALENT RADICAL OF THE CLASS CONSISTING OF ADIPYL, TEREPTHALOYL AND HEXANHYDORTERPHTHALOYL.
Claim 2
Dependent Claim
58 words
A HIGH MOLECULAR WEIGHT AND HIGH MELTING POINT COPOLYMER CONTAINING AMIDE AND URETHANE LINKAGES AND COMPOSED OF UNITS OF THE STRUCTURE FIG -01 WHEREIN THE PARENTHETICAL SUBSCRIPTS REPRESENT THE MOLAR PERCENTAGE AND RANGES OF PERMISSIBLE MOLAR PERCENTAGES OF EACH UNIT IN THE FINAL PRODUCT, Z BEING A DIVALENT RADICAL OF THE CLASS CONSISTING OF ADIPYL, TEREPTHALOYL AND HEXANHYDORTERPHTHALOYL.
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) | 1964-02-07 | 1964-08-08 | 1965-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-07 | 1968-08-08 | 1969-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-07 | 1972-08-08 | 1973-02-07 | $7700.00 | Window Closed / Lapsed |