Patent US3251252A successfully refreshed from Google Patents.
US3251252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of slitting thermoplastic films
Assignee: Dow Chemical Co
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Filing: 1965-03-08
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Granted: 1966-05-17
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Expires: 1985-03-08
Abstract
No abstract record available.
Inventors
- 👤 Lloyd E Lefevre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:10
CPC Classifications
B; B26; B26D; B26D1/00; B26D1/01; B26D1/02; B26D1/03; B26D1/035; B26F; B26F3/00; B26F3/06; Y; Y10; Y10T; Y10T83/00; Y10T83/04; Y10T83/0405; Y10T83/041; Y10T83/0414; Y10T83/283; Y10T83/293; Y10T83/647; Y10T83/6584; Y10T83/6606
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A METHOD OF SLITTING ONE OR MORE RIBBONS FROM A FLAT FILM OF THERMOPLASTIC MATERIAL COMPRISING THE STEPS OF, ARRANGING A PLURALITY OF BLADES WITH THE CUTTING EDGES IN PARALLEL RELATIONSHIP, HEATING THE BLADES TO MAINTAIN A TEMPERATURE WITHIN THE SOFTENING POINT OF THE MATERIAL BUT BELOW THE MELTING POINT THEREOF TO PREVENT DULLING OF SAID BLADES AND TO EFFECT A SMOOTH EDGE ON SAID RIBBONS, AND CAUSING RELATIVE MOVEMENT BETWEEN THE FILM AND THE BLADES IN THE DIRECTION OF BLADE LENGTH WITH THE CUTTING EDGES OF THE BLADES PASSING THROUGH THE FILM.
Claim 2
Independent Claim
93 words
A METHOD OF SLITTING ONE OR MORE RIBBONS FROM A FLAT FILM OF THERMOPLASTIC MATERIAL COMPRISING THE STEPS OF, ARRANGING A PLURALITY OF BLADES WITH THE CUTTING EDGES IN PARALLEL RELATIONSHIP, HEATING THE BLADES TO MAINTAIN A TEMPERATURE WITHIN THE SOFTENING POINT OF THE MATERIAL BUT BELOW THE MELTING POINT THEREOF TO PREVENT DULLING OF SAID BLADES AND TO EFFECT A SMOOTH EDGE ON SAID RIBBONS, AND CAUSING RELATIVE MOVEMENT BETWEEN THE FILM AND THE BLADES IN THE DIRECTION OF BLADE LENGTH WITH THE CUTTING EDGES OF THE BLADES PASSING THROUGH THE FILM.
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) | 1969-05-16 | 1969-11-15 | 1970-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-16 | 1973-11-15 | 1974-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-16 | 1977-11-15 | 1978-05-17 | $7700.00 | Window Closed / Lapsed |