US3773870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubing irradiation process
Assignee: Dow Chemical Co
•
Filing: 1971-08-13
•
Granted: 1973-11-20
•
Expires: 1991-08-13
Abstract
Abstract A PROCESS FOR IRRADIATING PLASTIC TUBING SUCH THAT THE DOSAGE IMPARTED TO THE TUBING IS UNIFORM AS TO DEPTH AND AREA. THE TUBING IS PASSED TO A FLATTENING ZONE, THEN TO AN IRRADIATION ZONE, THEN REVERSED, INVERTED, AND THE SEQUENCE IS REPEATED A PLURALITY OF TIMES. THE FLATTENING ZONE COMPRISES A FLAT ROLLER OR EQUIVALENT MEANS. THE IRRADIATION ZONE COMPRISES AN ELECTRON BEAM GUN OR AN EQUIVALENT IRRADIATION SOURCE. THE REVERSING AND INVERTING IS ACCOMPLISHED BY A SERIES OF WHEELS AND GUIDE ROLLERS ARRANGED ADJACENT TO THE FLAT ROLLERS.
Inventors
- 👤 F Spillers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:39
CPC Classifications
B; B29; B29C; B29C71/00; B29C71/04; B29C35/00; B29C35/02; B29C35/08; B29C35/0866; B29C2035/0877; B29C2791/00; B29C2791/001; B29C48/00; B29C48/001; B29C48/0018; B29C48/0019; B29C48/03; B29C48/09; B29C48/10; B29L; B29L2023/00; B29L2023/001
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |