Patent US3737481A successfully refreshed from Google Patents.
US3737481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improved process for preparing photochemically hardenable compositions comprising a photosensitive substance and an unsaturated polyester
Assignee: Societa Italiana Resine SpA SIR
•
Filing: 1971-06-30
•
Granted: 1973-06-05
•
Expires: 1991-06-30
Abstract
Abstract THERE IS DISCLOSED A PROCESS FOR PREPARING AN IMPROVED PHOTOCHEMICALLY HARDENABLE COMPOSITION COMPRISING A PHOTOSENSITIVE SUBSTANCE AND AN UNSATURATED POLYESTER FORMED BY REACTING AN ACRYLIC OR VINYL MONOMER WITH THE POLYCONDENSATION PRODUCT OF A POLYCARBOXYLIC ACID AND A POLYHYDRIC ALCOHOL, WHEREIN PRIOR TO MIXING THE PHOTOSENSITIVE SUBSTANCE WITH THE UNSATURATED POLYESTER, SAID POLYESTER IS FIRST TREATED WITH 0.1 TO 1.0 PART BY WEIGHT FOR EVERY 100 PARTS BY WEIGHT OF SAID POLYESTER, OF AN OXIDE OF AN ALKALINE EARTH METAL, AT A TEMPERATURE OF FROM 40 TO 70*C., AND FOR A TIME RANGE OF FROM 0.2 TO 3.0 HOURS.
Inventors
- 👤 S Vargiu
- 👤 B Passalenti
- 👤 U Nistri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:50
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08F; C08F283/00; C08F283/01
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |