US3864993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film retriever
Assignee: 3M Co
•
Filing: 1974-04-04
•
Granted: 1975-02-11
•
Expires: 1994-04-04
Abstract
Abstract A FILM RETRIEVER FOR RETRIEVING THE END OF A CONVOLUTELY WOUND FILM FROM THE INTERIOR OF A FILM CASSETTE IS FORMED FROM A THIN FLEXIBLE STRIP OF MATERIAL HAVING A THICKNESS OF ABOUT 0.0015 TO 0.006 INCH. THE STRIP IS SUFFICIENTLY FLEXIBLE TO CONFORM EASILY TO THE INTERNAL DIAMETER OF THE CASSETTE, BUT HAS SUFFICIENT RIGIDITY TO ALLOW THE STRIP TO BE FORCED INTO A NARROW EXIT OPENING OF THE CASSETTE. ATTACHED TO ONE END OF THE STRIP IS A THIN LAYER OF NORMALLY TACKY PRESSURE SENSITIVE ADHESIVE WHICH HAS SUFFICIENT INTEGRITY TO RESIST GUMMING AND ROLLING WHEN INSERTED THROUGH THE EXIT OPENING OF THE CASSETTE AND HAS SUFFICIENT TACK TO PULL THE END OF THE FILM THROUGH THE EXIT OPENING OF THE CASSETTE.
Inventors
- 👤 Gary L Hovind
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:54
CPC Classifications
G; G03; G03D; G03D13/00; G03D13/003; G03D13/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3040352A
Cited
US3261237A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |