US3613281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic file folders
Assignee: Individual
•
Filing: 1970-03-06
•
Granted: 1971-10-19
•
Expires: 1990-03-06
Abstract
Abstract FILE FOLDER OF PLASTIC HAVING THICKENED SECTION AT CRITICAL WEAR ZONES. THE FILE FOLDER IS MADE FROM TUBULAR PLASTIC EXTRUDING IN SUCH A MANNER AS TO HAVE THICKENED ZONES AT DIAMETRICALLY LOCATED PORTIONS. THE TUBING IS THEN FLATTENED WITH THE FOLD POINTS CENTRALLY OF THE THICKENED ZONE. LASTLY, THE FLATTENED TUBING IS TRIMMED ADJACENT A FOLD TO ELIMINATE THE BIGHT BUT TO LEAVE THICKENED FREE EDGES.
Inventors
- 👤 Walter Lennartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:01
CPC Classifications
B; B42; B42F; B42F13/00; B42F13/02; B42F13/06; B42F7/00; B42F7/02
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) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |