US2944294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods for treating polymeric plastic surfaces
Assignee: Polaroid Corp
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Filing: 1957-07-01
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Granted: 1960-07-12
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Expires: 1977-07-01
Abstract
No abstract record available.
Inventors
- 👤 Francis J Bourbeau
- 👤 Greenhalgh John
- 👤 Jr Claude F Valle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:12
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/02; B; B24; B24B; B24B1/00; B29; B29C; B29C59/00; B29C59/02; B29C71/00; B29C71/0009; G; G03; G03C; G03C1/00; G03C1/76; G03C1/775; G03C1/79; G03C8/00; G03C8/42; G03C8/52; B29C59/04; B29K; B29K2001/00; B29K2001/08; B29K2001/12; C08J2301/00; C08J2301/08; C08J2301/10; C08J2301/12; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
THE METHOD OF POLISHING THE SURFACE OF A SUBSTANTIALLY SOLVENT-FREE, HARDENED THERMOPLASTIC POLYMERIC LAYER CARRIED UPON A PAPER SUPPORT TO A HIGH GLOSS WHICH COMPRISES THE STEPS OF PROVIDING AT LEAST ONE SOURCE OF A SOFTENING AGENT FOR SAID POLYMERIC LAYER, MOVING SAID POLYMERIC LAYER PAST SAID SOURCE OF SOFTENING AGENT, CONTACTING SAID POLYMERIC LAYER DURING MOVEMENT PAST SAID SOURCE WITH A QUANTITY OF SOFTENING AGENT SUFFICIENT TO SOFTEN ONLY A THIN SURFACE PORTION OF SAID POLYMERIC LAYER, SUBSTANTIALLY IMMEDIATELY AFTER PASSING SAID SOURCE PRESSING THE SOFTENED LAYER SURFACE INTO CONTACT WITH A ROTATING SMOOTH-SURFACED POLISHING ELEMENT, SAID POLISHING ELEMENT BEING HEATED TO A TEMPERATURE SUFFICIENT TO SUBSTANTIALLY REDRY SAID SOFTENED LAYER SURFACE, AND MAINTAINING SAID SOFTENED LAYER SURFACE IN CONTACT WITH SAID HEATED, ROTATING POLISHING ELEMENT UNTIL A SMOOTH, HARD, HIGH-GLOSS SURFACE IS FORMED.
Claim 2
Independent Claim
135 words
THE METHOD OF POLISHING THE SURFACE OF A SUBSTANTIALLY SOLVENT-FREE, HARDENED THERMOPLASTIC POLYMERIC LAYER CARRIED UPON A PAPER SUPPORT TO A HIGH GLOSS WHICH COMPRISES THE STEPS OF PROVIDING AT LEAST ONE SOURCE OF A SOFTENING AGENT FOR SAID POLYMERIC LAYER, MOVING SAID POLYMERIC LAYER PAST SAID SOURCE OF SOFTENING AGENT, CONTACTING SAID POLYMERIC LAYER DURING MOVEMENT PAST SAID SOURCE WITH A QUANTITY OF SOFTENING AGENT SUFFICIENT TO SOFTEN ONLY A THIN SURFACE PORTION OF SAID POLYMERIC LAYER, SUBSTANTIALLY IMMEDIATELY AFTER PASSING SAID SOURCE PRESSING THE SOFTENED LAYER SURFACE INTO CONTACT WITH A ROTATING SMOOTH-SURFACED POLISHING ELEMENT, SAID POLISHING ELEMENT BEING HEATED TO A TEMPERATURE SUFFICIENT TO SUBSTANTIALLY REDRY SAID SOFTENED LAYER SURFACE, AND MAINTAINING SAID SOFTENED LAYER SURFACE IN CONTACT WITH SAID HEATED, ROTATING POLISHING ELEMENT UNTIL A SMOOTH, HARD, HIGH-GLOSS SURFACE IS FORMED.
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) | 1963-07-12 | 1964-01-11 | 1964-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-12 | 1968-01-11 | 1968-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-12 | 1972-01-11 | 1972-07-12 | $7700.00 | Window Closed / Lapsed |