Patent US2952878A successfully refreshed from Google Patents.
US2952878A
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Stretchable crystalline polyoxymethylene film and process for providing such film by rolling
Assignee: EIDP Inc
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Filing: 1956-08-02
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Granted: 1960-09-20
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Expires: 1976-08-02
Abstract
No abstract record available.
Inventors
- 👤 Swerlick Isadore
- 👤 Frank P Gay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:50
CPC Classifications
B; B32; B32B; B32B27/00; B29; B29C; B29C55/00; B29C55/005; B29C55/02; B29C55/10; B29C55/12; B29C55/18; B29C67/00; B29C71/00; B29K; B29K2059/00; Y; Y10; Y10S; Y10S264/00; Y10S264/73
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
64 words
THE PROCESS WHICH COMPRISES PRESSURE-ROLLING TRANSLUCENT TO OPAQUE CRYSTALLINE POLYOXYMETHYLENE FILM CONTAINING DETECTABLE SPHERULITES, AT A ROLL TEMPERATURE NOT EXCEEDING 120*C. UNTIL THE FILM IS CLEAR AND SUBSTANTIALLY NO SPERULITES ARE DETECTABLE AND THEREAFTER STRETCHING SAID FILM AT LEAST 20% AT A TEMPERATURE WITHIN THE RANGE OF FROM 65*C. BELOW THE OPTICAL MELTING POINT RANGE OF SAID POLYXYMETHYLENE TO SAID OPTICAL MELTING POINT RANGE.
Claim 2
Dependent Claim
64 words
THE PROCESS WHICH COMPRISES PRESSURE-ROLLING TRANSLUCENT TO OPAQUE CRYSTALLINE POLYOXYMETHYLENE FILM CONTAINING DETECTABLE SPHERULITES, AT A ROLL TEMPERATURE NOT EXCEEDING 120*C. UNTIL THE FILM IS CLEAR AND SUBSTANTIALLY NO SPERULITES ARE DETECTABLE AND THEREAFTER STRETCHING SAID FILM AT LEAST 20% AT A TEMPERATURE WITHIN THE RANGE OF FROM 65*C. BELOW THE OPTICAL MELTING POINT RANGE OF SAID POLYXYMETHYLENE TO SAID OPTICAL MELTING POINT RANGE.
Claim 3
Dependent Claim
15 words
A TRANSPARENT, BIAXIALLY-ORIENTED, BALANCED, CRYSTAL LINE POLYOXYMETHYLENE FILM CHARACTERIZED BY HAVING SUBSTANTIALLY NO SPHERULITES DETECTABLE.
Claim 4
Dependent Claim
15 words
A TRANSPARENT, BIAXIALLY-ORIENTED, BALANCED, CRYSTAL LINE POLYOXYMETHYLENE FILM CHARACTERIZED BY HAVING SUBSTANTIALLY NO SPHERULITES DETECTABLE.
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) | 1963-09-20 | 1964-03-21 | 1964-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-20 | 1968-03-21 | 1968-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-20 | 1972-03-21 | 1972-09-20 | $7700.00 | Window Closed / Lapsed |