US3539657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-phase siloxane-polyarylene polyether block copolymers
Assignee: BP Corp North America Inc
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Filing: 1968-03-21
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Granted: 1970-11-10
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Expires: 1988-03-21
Abstract
No abstract record available.
Inventors
- 👤 Allen Noshay
- 👤 Markus Matzner
- 👤 Charles N Merriam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:55
CPC Classifications
C; C08; C08L; C08L71/00; C08G; C08G77/00; C08G77/42; C08G77/46; C08L81/00; C08L81/06; C08L2205/00; C08L2205/05; Y; Y10; Y10S; Y10S525/00; Y10S525/905; Y10S525/906
Claims Analysis
Total Claims: 0
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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) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |