Patent US2849359A successfully refreshed from Google Patents.
US2849359A
Expired / Lapsed
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Heat sealing of polyethylene terephthalate films
Assignee: Bridgestone Firestone Inc
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Filing: 1955-05-13
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Granted: 1958-08-26
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Expires: 1975-05-13
Abstract
No abstract record available.
Inventors
- 👤 Jr William Mayo Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:10
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/12; C08J5/122; C08J2367/00; C08J2367/02; Y; Y10; Y10S; Y10S138/00; Y10S138/03; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
PROCESS OF HEAT SEALING TOGETHER THE SURFACES OF FILMS OF POLYESTERS OF (A) ACIDS SELECTED FROM THE GROUP CONSISTING OF TEREPHTHALIC AND ISOPHTHALIC ACIDS AND MIXTURES OF SAID ACIDS WITH (B) GLYCOLS SELECTED FROM THE GROUP CONSISTING OF STRAIGHT AND BRANCHED-CHAIN GLYCOLS CONTAINING FROM 1 TO 5 CARBON ATOMS AND MIXTURES OF SAID GLYCOLS, WHICH COMPRISES COATING TE FAYING SURFACES OF THE FILMS WITH INCIPIENT PLASTICIZING AGENTS FOR SAID POLYESTERS SELECTED FROM THE GROUP CONSISTING OF
Claim 2
Dependent Claim
76 words
PROCESS OF HEAT SEALING TOGETHER THE SURFACES OF FILMS OF POLYESTERS OF (A) ACIDS SELECTED FROM THE GROUP CONSISTING OF TEREPHTHALIC AND ISOPHTHALIC ACIDS AND MIXTURES OF SAID ACIDS WITH (B) GLYCOLS SELECTED FROM THE GROUP CONSISTING OF STRAIGHT AND BRANCHED-CHAIN GLYCOLS CONTAINING FROM 1 TO 5 CARBON ATOMS AND MIXTURES OF SAID GLYCOLS, WHICH COMPRISES COATING TE FAYING SURFACES OF THE FILMS WITH INCIPIENT PLASTICIZING AGENTS FOR SAID POLYESTERS SELECTED FROM THE GROUP CONSISTING OF
References Cited (Backward Citations)
US2673826A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-25 | 1962-02-24 | 1962-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-25 | 1966-02-24 | 1966-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-25 | 1970-02-24 | 1970-08-26 | $7700.00 | Window Closed / Lapsed |