US4064776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for making tear resistant separable end-connected bags
Assignee: Union Carbide Corp
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Filing: 1976-06-15
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Granted: 1977-12-27
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Expires: 1996-06-15
Abstract
Abstract Continuous strip closed-bottom open-mouthed packaging bags are produced by continually making, at spaced intervals in a continuous flattened tubular oriented plastic film supply, a transversely extending heat seal to define a bag bottom, and, adjacent each heat seal, perforating the two plies of the film supply with a blade heated to effect annealing of the edges of the perforations and having a serrated cutting edge with spaced deep recesses to define connecting tabs between perforations.
Inventors
- 👤 Charles R. Walitalo
- 👤 Alvin E. Ericson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:41
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/74; B29C65/741; B29C65/7411; B29C65/7412; B29C65/02; B29C65/18; B29C65/24; B29C65/30; B29C65/305; B29C65/745; B29C65/7457; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/41; B29C66/43; B29C66/431; B29C66/4312; B29C66/80; B29C66/83; B29C66/832; B29C66/8322; B65; B65D; B65D33/00; B65D33/002; B29C66/70; B29C66/71; B31; B31B; B31B2155/00; B31B2155/003; B31B70/00; B31B70/74; B31B70/92; B31B70/94; B31B70/946; Y; Y10; Y10T; Y10T83/00; Y10T83/04; Y10T83/0405; Y10T83/041; Y10T83/0414; Y10T83/0596; Y10T83/283; Y10T83/293; Y10T83/384; Y10T83/403
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
89 words
Apparatus for forming discontinuous annealed edged perforations separated by tabs in flexible plastic film sheet material comprising, in combination, a serrated edged cutting blade having recesses disposed at spaced intervals extending into the blade from its cutting edge to beyond its cutting edge, said recesses being disposed at the apexes of crevices in the serrated edge of the blade, and means to heat the blade to a preselected temperature lower than the melting temperature of the plastic film sheet material in process, at which temperature the material will anneal.
Claim 2
Dependent Claim
89 words
Apparatus for forming discontinuous annealed edged perforations separated by tabs in flexible plastic film sheet material comprising, in combination, a serrated edged cutting blade having recesses disposed at spaced intervals extending into the blade from its cutting edge to beyond its cutting edge, said recesses being disposed at the apexes of crevices in the serrated edge of the blade, and means to heat the blade to a preselected temperature lower than the melting temperature of the plastic film sheet material in process, at which temperature the material will anneal.
Claim 3
Dependent Claim
13 words
Apparatus according to claim 1 wherein said recesses are substantially rectangular in form.
References Cited (Backward Citations)
US371736A
Cited
US1518260A
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US1972133A
Cited
US2748863A
Cited
US3590695A
Cited
USRE28911E
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-26 | 1981-06-27 | 1981-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-26 | 1985-06-27 | 1985-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-26 | 1989-06-27 | 1989-12-27 | $7700.00 | Window Closed / Lapsed |