Patent US3278358A successfully refreshed from Google Patents.
US3278358A
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Process and apparatus for the continuous heat sealing of plastic sheeting
Assignee: BASF SE
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Filing: 1961-12-11
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Granted: 1966-10-11
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Expires: 1981-12-11
Abstract
No abstract record available.
Inventors
- 👤 Rosewicz Horst
- 👤 Manhart Gernot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:29
CPC Classifications
B; B65; B65B; B65B51/00; B65B51/10; B65B51/20; B29; B29C; B29C65/00; B29C65/02; B29C65/10; B29C65/78; B29C65/7858; B29C65/7861; B29C65/787; B29C65/7873; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/41; B29C66/43; B29C66/431; B29C66/4312; B29C66/43121; B29C66/80; B29C66/81; B29C66/82; B29C66/822; B29C66/8221; B29C66/828; B29C66/8286; B29C66/83; B29C66/834; B29C66/8341; B29C66/83411; B29C66/83413; B29C66/836; B29C66/90; B29C66/92; B29C66/922; B29C66/9221; B29C66/924; B29C66/9241; B29C66/95; B29C66/954; B65B51/18; B29C66/70; B29C66/71; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29L; B29L2031/00; B29L2031/712; B29L2031/7126; B29L2031/7128
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
A PROCESS FOR CONTINUOUSLY AND RAPIDLY HEAT SEALING TWO PLIES OF PLASTIC SHEETING WHICH COMPRISES DIRECTING A STREAM OF HOT COMPRESSED AIR FROM BOTH SIDES OF THE COMBINED SHEETS ONTO THE SEAM WHILE SAID SHEETS ARE HELD AT BOTH SIDES OF SAID SEAM, SAID SEAM BEING FREE FOR THE IMPACT OF THE HOT AIR, CONVEYING SAID SHEETS WHIE COOLING SAID SEAM EXTERNALLY, WHEREBY THE SEAM SOLIDIFIES ON THE OUTSIDE WHILE REMAINING SOFT ON THE INSIDE, PRESSING TOGETHER SAID SEAM FROM BOTH SIDES IN ORDER TO EFFECT SEALING OF ANY UNSEALED PARTS OF SAID SEAM, AND REMOVING THE SEALED SHEETS.
Claim 2
Dependent Claim
99 words
A PROCESS FOR CONTINUOUSLY AND RAPIDLY HEAT SEALING TWO PLIES OF PLASTIC SHEETING WHICH COMPRISES DIRECTING A STREAM OF HOT COMPRESSED AIR FROM BOTH SIDES OF THE COMBINED SHEETS ONTO THE SEAM WHILE SAID SHEETS ARE HELD AT BOTH SIDES OF SAID SEAM, SAID SEAM BEING FREE FOR THE IMPACT OF THE HOT AIR, CONVEYING SAID SHEETS WHIE COOLING SAID SEAM EXTERNALLY, WHEREBY THE SEAM SOLIDIFIES ON THE OUTSIDE WHILE REMAINING SOFT ON THE INSIDE, PRESSING TOGETHER SAID SEAM FROM BOTH SIDES IN ORDER TO EFFECT SEALING OF ANY UNSEALED PARTS OF SAID SEAM, AND REMOVING THE SEALED SHEETS.
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) | 1969-10-10 | 1970-04-11 | 1970-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-10 | 1974-04-11 | 1974-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-10 | 1978-04-11 | 1978-10-11 | $7700.00 | Window Closed / Lapsed |