Patent US3732333A successfully refreshed from Google Patents.
US3732333A
Expired / Lapsed
US
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Formaldehyde block copolymers and processes
Assignee: Chevron USA Inc
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Filing: 1963-10-02
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Granted: 1973-05-08
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Expires: 1983-10-02
Abstract
Abstract THIS INVENTION RELATES TO NOVEL BLOCK COPOLYMERS OF FORMALDEHYDE AND TO PROCESSES FOR PREPARING SUCH COPOLYMERS. MORE SPECIFICALLY THE INVENTION CONCERNS BLOCK COPOLYMERS OF FORMALDEHYDE CONTAINING THE GROUPING A-B WHICH INCLUDES BOTH A-B TYPE BLOCK COPOLYMERS AND R-A-B TYPE BLOCK COPOLYMERS.
Inventors
- 👤 G Mantell
- 👤 W Smith
- 👤 F Galiano
- 👤 D Rankin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:48
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/18; C08F; C08F20/00; C08F20/62; C08F4/00; C08F4/06; C08F4/12; C08G2/26; C08G2/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |