Patent US3183705A successfully refreshed from Google Patents.
US2520737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of joining thick sheets of polyethylene
Assignee: Uniroyal Inc
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Filing: 1948-01-14
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Granted: 1950-08-29
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Expires: 1968-01-14
Abstract
No abstract record available.
Inventors
- 👤 Jr Hendrik Romeyn
- 👤 Ferrell Wesley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:20
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/70; B29C66/73; B29C66/735; B29C66/7352; B29C66/73521; B29C65/00; B29C65/02; B29C65/18; B29C66/01; B29C66/03; B29C66/032; B29C66/0322; B29C66/0324; B29C66/03241; B29C66/034; B29C66/0342; B29C66/40; B29C66/41; B29C66/43; B29C66/71; B29C66/90; B29C66/91; B29C66/914; B29C66/9141; B29C66/91411; B29C66/91441; B29C66/91443; B29C66/91445; B29C66/92; B29C66/924; B29C66/9241; B29C66/9261; B29C66/92651; B29C66/92655; C; C08; C08J; C08J5/00; C08J5/12; C08J5/121; B29C66/929; B29K; B29K2023/00; B29K2023/04; B29K2023/06; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/06; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1036; Y10T156/1038
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
THE METHOD OF JOINING TWO EDGES OF SHEET MATERIAL CONSISTING OF POLYETHYLENE, SAID MATERIAL HAVING A THICKNESS OF AT LEAST 0.01 INCH, WHICH COMPRISES LAPPING SAID EDGES, HEATING THE MATERIAL AT THE INTERFACE OF THE OVERLAP TO A TEMPERATURE OF NOT LESS THAN 5*C. BELOW AND NOT MORE THAN 15*C. ABOVE THE MELTING POINT OF THE POLYETHYLENE AND, THROUGHOUT SAID HEATING, CONFINING AND SUBJECTING TO POSITIVE PRESSURE THE MATERIAL AT THE OVERLAP UNTIL AN INTEGRAL JOINT IS FORMED, SUBSEQUENTLY COOLING SAID JOINT, AND CONTINUING SAID CONFINING STEP AND THE APPLICATION OF SAID PRESSURE UNTIL SAID JOINT HAS BEEN COOLED TO A TEMPERATURE AT LEAST 5*C. BELOW SAID MELTING POINT.
Claim 2
Independent Claim
109 words
THE METHOD OF JOINING TWO EDGES OF SHEET MATERIAL CONSISTING OF POLYETHYLENE, SAID MATERIAL HAVING A THICKNESS OF AT LEAST 0.01 INCH, WHICH COMPRISES LAPPING SAID EDGES, HEATING THE MATERIAL AT THE INTERFACE OF THE OVERLAP TO A TEMPERATURE OF NOT LESS THAN 5*C. BELOW AND NOT MORE THAN 15*C. ABOVE THE MELTING POINT OF THE POLYETHYLENE AND, THROUGHOUT SAID HEATING, CONFINING AND SUBJECTING TO POSITIVE PRESSURE THE MATERIAL AT THE OVERLAP UNTIL AN INTEGRAL JOINT IS FORMED, SUBSEQUENTLY COOLING SAID JOINT, AND CONTINUING SAID CONFINING STEP AND THE APPLICATION OF SAID PRESSURE UNTIL SAID JOINT HAS BEEN COOLED TO A TEMPERATURE AT LEAST 5*C. BELOW SAID MELTING POINT.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-28 | 1954-02-27 | 1954-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-28 | 1958-02-27 | 1958-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-28 | 1962-02-27 | 1962-08-29 | $7700.00 | Window Closed / Lapsed |