Patent US3200557A successfully refreshed from Google Patents.
US3200557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for sealing milk containers and the like
Assignee: International Paper Co
•
Filing: 1961-09-25
•
Granted: 1965-08-17
•
Expires: 1981-09-25
Abstract
No abstract record available.
Inventors
- 👤 William E Schwenk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:40
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29B; B29B13/00; B29B13/02; B29B13/023; B29B13/024; B29B13/025; B29C65/00; B29C65/02; B29C65/14; B29C65/1429; B29C65/1432; B29C65/1445; B29C65/1464; B29C65/1467; B29C65/1487; B29C65/78; B29C65/7858; B29C65/7861; B29C65/787; B29C65/7873; B29C66/003; B29C66/40; B29C66/41; B29C66/43; B29C66/431; B29C66/4312; B29C66/43121; B29C66/43122; B29C66/70; B29C66/71; B29C66/72; B29C66/723; B29C66/7232; B29C66/72327; B29C66/72328; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29C66/80; B29C66/81; B29C66/814; B29C66/8141; B29C66/81411; B29C66/81425; B29C66/83; B29C66/832; B29C66/8322; B29C66/83221; B29C66/84; B29C66/849; B29C66/87; B29C66/874; B29C66/8744; B29C66/87445; B65; B65B; B65B51/00; B65B51/10; B65B51/14; B65B51/144; B65B7/00; B65B7/16; B65B7/18; B29C65/1403; B29C65/1412; B29C66/876; B29L; B29L2031/00; B29L2031/712; B29L2031/7162; B29L2031/7166
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
167 words
IN THE METHOD OF FORMING A LIQUID-TIGHT SEAL AT THE TOP OF A CONTAINER MADE FROM A FLEXIBLE BLANK HAVING A HEAT-SEALABLE PLASTIC COATING ON BOTH SIDES THEREOF, SAID CONTAINER TOP BEING FORMED BY FOLDING SAID BLANK ALONG SCORE LINES AND HEAT SEALING OVERLAPPING SURFACES OF THE FOLDED BLANK, THE STEPS OF ADVANCING SAID CONTAINER WITH THE TOP SUBSTANTIALLY OPEN THROUGH A HEATING ZONE, PERIODICALLY STOPPING THE ADVANCE OF SAID CONTAINER THROUGH SAID HEATING ZONE TO PROVIDE SUCCESSIVE INTERVALS OF MOTION AND DWELL, DIRECTING HEAT RAYS ONTO THE TOP OF SAID CONTAINER WHILE SAID CONTAINER IS IN SAID HEATING ZONE TO HEAT THE PLASTIC COATINGS OF SAID OVERLAPPING SURFACES TO BE JOINED TO FORM THE TOP CLOSURE OF SAID CONTAINER TO A HEAT-SEALING TEMPERATURE, AND PARTIALLY SHIELDING SAID CONTAINER FROM SAID HEAT RAYS DURING SAID INTERVALS OF DWELL BY PROVIDING BAFFLE MEMBERS LOCATED IN THE PATH OF SAID HEAT RAYS AND SPACED FROM EACH OTHER IN THE DIRECTION OF ADVANCE OF SAID CONTAINER, SAID BAFFLE MEMBERS DEFLECTING
Claim 2
Dependent Claim
167 words
IN THE METHOD OF FORMING A LIQUID-TIGHT SEAL AT THE TOP OF A CONTAINER MADE FROM A FLEXIBLE BLANK HAVING A HEAT-SEALABLE PLASTIC COATING ON BOTH SIDES THEREOF, SAID CONTAINER TOP BEING FORMED BY FOLDING SAID BLANK ALONG SCORE LINES AND HEAT SEALING OVERLAPPING SURFACES OF THE FOLDED BLANK, THE STEPS OF ADVANCING SAID CONTAINER WITH THE TOP SUBSTANTIALLY OPEN THROUGH A HEATING ZONE, PERIODICALLY STOPPING THE ADVANCE OF SAID CONTAINER THROUGH SAID HEATING ZONE TO PROVIDE SUCCESSIVE INTERVALS OF MOTION AND DWELL, DIRECTING HEAT RAYS ONTO THE TOP OF SAID CONTAINER WHILE SAID CONTAINER IS IN SAID HEATING ZONE TO HEAT THE PLASTIC COATINGS OF SAID OVERLAPPING SURFACES TO BE JOINED TO FORM THE TOP CLOSURE OF SAID CONTAINER TO A HEAT-SEALING TEMPERATURE, AND PARTIALLY SHIELDING SAID CONTAINER FROM SAID HEAT RAYS DURING SAID INTERVALS OF DWELL BY PROVIDING BAFFLE MEMBERS LOCATED IN THE PATH OF SAID HEAT RAYS AND SPACED FROM EACH OTHER IN THE DIRECTION OF ADVANCE OF SAID CONTAINER, SAID BAFFLE MEMBERS DEFLECTING
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) | 1968-08-16 | 1969-02-15 | 1969-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-16 | 1973-02-15 | 1973-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-16 | 1977-02-15 | 1977-08-17 | $7700.00 | Window Closed / Lapsed |