US3637549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyol/lactam/synthetic resin modified urea-formaldehyde resins
Assignee: Fibreglass Ltd
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Filing: 1969-09-02
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Granted: 1972-01-25
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Expires: 1989-09-02
Abstract
Abstract A UREA-FORMALDEHYDE RESIN FOR USE IN BONDING GLASS FIBRES COMPRISES 1 MOLE OF UREA TOGETHER WITH FROM 3 TO 5 MOLES OF FORMALDEHYDE COPOLYMERISED WITH 0.05 MOLE OF A POLYOL AND FROM 10 TO 50% OF A LACTAM BASED ON THE AMOUNT OF UREA PRESENT.
Inventors
- 👤 Michael Edgar Hall
- 👤 Malcolm Negus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:28
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/40; C03; C03C; C03C25/00; C03C25/10; C03C25/24; C03C25/26; C03C25/32; C03C25/34; C08L; C08L61/00; C08L61/20; C08L61/32
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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |