Patent US3802155A successfully refreshed from Google Patents.
US3802155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shrink wrapping system
Assignee: Individual
•
Filing: 1972-09-15
•
Granted: 1974-04-09
•
Expires: 1992-09-15
Abstract
Abstract An improved method and apparatus for wrapping articles with a plastic film that shrinks when heated wherein the shrink characteristic of the film in a restrained state is utilized in the severing of the film simultaneously with bonding layers of the film on opposite sides of the area that is severed. This is accomplished by dynamically forcing hot gas through a restrained area of film to cause it to quickly shrink and tear itself apart.
Inventors
- 👤 K Thomas
- 👤 J Grange
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:41
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/74; B29C65/747; B29C65/7471; B29C65/02; B29C65/10; B29C66/00; B29C66/40; B29C66/41; B29C66/43; B29C66/431; B29C66/70; B29C66/73; B29C66/737; B29C66/7371; B29C66/73715; B29C66/80; B29C66/84; B29C66/861; B65; B65B; B65B51/00; B65B51/10; B65B51/20; B65B53/00; B65B53/02; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
165 words
Apparatus for concurrently cutting and sealing multiple layers of plastic film, said apparatus comprising a fixed position support member having a narrow unrestricted slot therein, means providing a supply of film in multilayer form located so that layers of said film are positioned in overlying relation with said slot, means clamping said film at opposite sides of said slot comprising a clamp member movable between a release position spaced from said support member and a clamp position adjacent said support member and capable of clamping said layers of film between said members, said clamp member having a slot therein aligned with said support member slot and providing access to the area of film clamped between said members, and means dynamically forcing hot gas through the film between said slots in sufficient quantity and at a sufficiently high temperature to cause said film to shrink and thereby pull itself apart and heat seal the edges of said layers on opposite sides of the pulled apart area.
Claim 2
Dependent Claim
165 words
Apparatus for concurrently cutting and sealing multiple layers of plastic film, said apparatus comprising a fixed position support member having a narrow unrestricted slot therein, means providing a supply of film in multilayer form located so that layers of said film are positioned in overlying relation with said slot, means clamping said film at opposite sides of said slot comprising a clamp member movable between a release position spaced from said support member and a clamp position adjacent said support member and capable of clamping said layers of film between said members, said clamp member having a slot therein aligned with said support member slot and providing access to the area of film clamped between said members, and means dynamically forcing hot gas through the film between said slots in sufficient quantity and at a sufficiently high temperature to cause said film to shrink and thereby pull itself apart and heat seal the edges of said layers on opposite sides of the pulled apart area.
Claim 3
Dependent Claim
23 words
Apparatus according to claim 1 further including means on said support member providing a manifold communicating with said slot in said support member.
Claim 4
Dependent Claim
29 words
Apparatus according to claim 1 wherein said means providing said supply of film comprises a frame supporting said members and a roll of said film mounted on said frame.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-08 | 1977-10-08 | 1978-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-08 | 1981-10-08 | 1982-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-08 | 1985-10-08 | 1986-04-09 | $7700.00 | Window Closed / Lapsed |