US3547842A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame-retardant polyurethanes
Assignee: Wyeth Holdings LLC
•
Filing: 1969-08-05
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Granted: 1970-12-15
•
Expires: 1989-08-05
Abstract
No abstract record available.
Inventors
- 👤 John Harvey Bright
- 👤 Joseph Frederick Cannelongo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:03
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0014; C08J9/0038; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/53; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR1213171A
Cited
GB930397A
Cited
US3257337A
Cited
US3400085A
Cited
GB1012653A
Cited
GB1028158A
Cited
GB1020310A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-14 | 1974-06-15 | 1974-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-14 | 1978-06-15 | 1978-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-14 | 1982-06-15 | 1982-12-15 | $7700.00 | Window Closed / Lapsed |