Patent US4686380A successfully refreshed from Google Patents.
Patent US3046249A successfully refreshed from Google Patents.
US3046249A
Expired / Lapsed
US
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Polymers of formaldehyde stabilized with hydroxyanthraquinones and process for making them
Assignee: Hoechst AG
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Filing: 1959-11-17
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Granted: 1962-07-24
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Expires: 1979-11-17
Abstract
No abstract record available.
Inventors
- 👤 Hermann Hans Dieter
- 👤 Fischer Edgar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:10
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/07; C08K5/08; C08K5/13; C08K5/132
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
COMPOSITIONS OF MATTER COMPRISING A POLYFORMALDEHYDE WHICH LOSES LESS THAN 80% OF ITS WEIGHT WITHIN 30 MINUTES AT 200*C. UNDER NITROGEN AND AS STABILIZER 0.01 TO 10%, CALCUATED UPON THE WEIGHT OF THE POLYFORMALDEHYDE, OF A HYDROXYANTHRAQUINONE CONTAINING 2 TO 8 HYDROXYL GROUPS.
Claim 2
Dependent Claim
43 words
COMPOSITIONS OF MATTER COMPRISING A POLYFORMALDEHYDE WHICH LOSES LESS THAN 80% OF ITS WEIGHT WITHIN 30 MINUTES AT 200*C. UNDER NITROGEN AND AS STABILIZER 0.01 TO 10%, CALCUATED UPON THE WEIGHT OF THE POLYFORMALDEHYDE, OF A HYDROXYANTHRAQUINONE CONTAINING 2 TO 8 HYDROXYL GROUPS.
References Cited (Backward Citations)
US2871220A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-07-23 | 1966-01-22 | 1966-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-23 | 1970-01-22 | 1970-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-23 | 1974-01-22 | 1974-07-24 | $7700.00 | Window Closed / Lapsed |