Patent US3147169A successfully refreshed from Google Patents.
Patent US3263540A successfully refreshed from Google Patents.
US3263540A
Expired / Lapsed
US
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Apparatus for slitting plastic film
Assignee: Dow Chemical Co
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Filing: 1964-05-27
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Granted: 1966-08-02
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Expires: 1984-05-27
Abstract
No abstract record available.
Inventors
- 👤 Lloyd E Lefevre
- 👤 Harold A Brejcha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:38
CPC Classifications
B; B26; B26F; B26F3/00; B26F3/06; B26F3/08; D; D01; D01D; D01D5/00; D01D5/42; D01D5/426; Y; Y10; Y10T; Y10T83/00; Y10T83/283; Y10T83/293; Y10T83/647; Y10T83/6584; Y10T83/6603; Y10T83/929; Y10T83/9309; Y10T83/9312
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
APPARATUS FOR SLITTING THERMOPLASTIC FILM COMPRISING, A ROLL FORMED TO PROVIDE A PLURALITY OF PARALLEL ARRANGED PERIPHERAL GROOVES, A BLADE ASSEMBLY INCLUDING A PLURALITY OF BLADES EACH HAVING AT LEAST ONE CUTTING EDGE WHICH IS POSITIONED FOR ENTERING ONE OF SAID GROOVES, A SLOT FORMED IN EACH OF SAID BLADES EXTENDING SUBSTANTIALLY THROUGH SAID BLADE FORMING A PATH OF LEAST RESISTANCE TO CURENT FLOW THROUGH THE TIP OF EACH OF SAID BLADES, SPACER SUPPORT MEANS FOR SAID PLURALITY OF BLADES AND MEANS FOR PROVIDING CURRENT FLOW THROUGH SAID BLADES, WHEREBY THE TIPS OF SAID BLADES ARE HEATED.
Claim 2
Dependent Claim
97 words
APPARATUS FOR SLITTING THERMOPLASTIC FILM COMPRISING, A ROLL FORMED TO PROVIDE A PLURALITY OF PARALLEL ARRANGED PERIPHERAL GROOVES, A BLADE ASSEMBLY INCLUDING A PLURALITY OF BLADES EACH HAVING AT LEAST ONE CUTTING EDGE WHICH IS POSITIONED FOR ENTERING ONE OF SAID GROOVES, A SLOT FORMED IN EACH OF SAID BLADES EXTENDING SUBSTANTIALLY THROUGH SAID BLADE FORMING A PATH OF LEAST RESISTANCE TO CURENT FLOW THROUGH THE TIP OF EACH OF SAID BLADES, SPACER SUPPORT MEANS FOR SAID PLURALITY OF BLADES AND MEANS FOR PROVIDING CURRENT FLOW THROUGH SAID BLADES, WHEREBY THE TIPS OF SAID BLADES ARE HEATED.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-01 | 1970-01-31 | 1970-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-01 | 1974-01-31 | 1974-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-01 | 1978-01-31 | 1978-08-02 | $7700.00 | Window Closed / Lapsed |