Patent US3345797A successfully refreshed from Google Patents.
US3345797A
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Heat sealing method and apparatus
Assignee: Dow Chemical Co
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Filing: 1964-08-03
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Granted: 1967-10-10
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Expires: 1984-08-03
Abstract
No abstract record available.
Inventors
- 👤 Stoeser Walter George Von
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:16
CPC Classifications
B; B65; B65B; B65B7/00; B65B7/16; B65B7/162; B65B7/164; B29; B29C; B29C65/00; B29C65/02; B29C65/18; B29C65/24; B29C65/30; B29C65/305; B29C65/74; B29C65/745; B29C65/7451; B29C65/7453; B29C65/7457; B29C65/78; B29C65/7841; B29C65/7858; B29C65/7888; B29C65/7891; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/118; B29C66/20; B29C66/24; B29C66/242; B29C66/2422; B29C66/24221; B29C66/50; B29C66/51; B29C66/53; B29C66/534; B29C66/5346; B29C66/53461; B29C66/80; B29C66/81; B29C66/816; B29C66/8161; B29C66/82; B29C66/822; B29C66/8221; B29C66/8225; B29C66/8226; B29C66/83; B29C66/832; B29C66/8322; B29C66/90; B29C66/91; B29C66/912; B29C66/9121; B29C66/91211; B29C66/91212; B29C66/91231; B29C66/914; B29C66/9141; B29C66/91421; B29C66/91431; B65B29/00; B65B29/02; B29C2793/00; B29C2793/0045; B29C66/70; B29C66/71; B29C66/8167; B29L; B29L2031/00; B29L2031/712
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
A METHOD OF CLOSING THE OPEN END OF A PLASTIC CONTAINER WITH A HEAT SEALABLE PLASTIC FILM COMPRISING THE STEPS OF, DRAWING A STRIP OF PLASTIC FILM FROM A ROLL AND POSITIONING A GIVEN PORTION OF THE STRIP IN SPACED PARALLEL RELATION TO A FLAT HEATED PLATEN, POSITIONING A PLASTIC CONTAINER HAVING AN OPENING WITH THE PERIPHERY THEREOF IN SPACED PARALLEL RELATION TO THE PLATEN, MOVING THE CONTAINER SO THAT THE EDGE OF THE OPENING IS BROUGHT INTO ENGAGEMENT WITH THE FILM, CONTINUING SAID MOVEMENT SO THAT THE FILM IS FORCED INTO FIRM ENGAGEMENT WITH THE HEATED PLATEN TO EFFECT A HEAT SEAL OF THE FILM TO THE CONTAINER, FORMING A SMALL OPENING IN THE FILM AND WITHIN THE CONFINES OF THE PERIPHERAL EDGE OF THE OPENING AS THE FILM IS FORCED INTO FIRM ENGAGEMENT WITH THE HEATED PLATEN, CUTTING OFF SAID GIVEN PORTION OF THE STRIP FROM THE ROLL, AND REMOVING THE CONTAINER WITH ATTACHED FILM FROM ENGAGEMENT WITH THE HEATED PLATEN.
Claim 2
Independent Claim
163 words
A METHOD OF CLOSING THE OPEN END OF A PLASTIC CONTAINER WITH A HEAT SEALABLE PLASTIC FILM COMPRISING THE STEPS OF, DRAWING A STRIP OF PLASTIC FILM FROM A ROLL AND POSITIONING A GIVEN PORTION OF THE STRIP IN SPACED PARALLEL RELATION TO A FLAT HEATED PLATEN, POSITIONING A PLASTIC CONTAINER HAVING AN OPENING WITH THE PERIPHERY THEREOF IN SPACED PARALLEL RELATION TO THE PLATEN, MOVING THE CONTAINER SO THAT THE EDGE OF THE OPENING IS BROUGHT INTO ENGAGEMENT WITH THE FILM, CONTINUING SAID MOVEMENT SO THAT THE FILM IS FORCED INTO FIRM ENGAGEMENT WITH THE HEATED PLATEN TO EFFECT A HEAT SEAL OF THE FILM TO THE CONTAINER, FORMING A SMALL OPENING IN THE FILM AND WITHIN THE CONFINES OF THE PERIPHERAL EDGE OF THE OPENING AS THE FILM IS FORCED INTO FIRM ENGAGEMENT WITH THE HEATED PLATEN, CUTTING OFF SAID GIVEN PORTION OF THE STRIP FROM THE ROLL, AND REMOVING THE CONTAINER WITH ATTACHED FILM FROM ENGAGEMENT WITH THE HEATED PLATEN.
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) | 1970-10-09 | 1971-04-10 | 1971-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-09 | 1975-04-10 | 1975-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-09 | 1979-04-10 | 1979-10-10 | $7700.00 | Window Closed / Lapsed |