US3693020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photodegradometer
Assignee: M&T Chemicals Inc
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Filing: 1969-11-04
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Granted: 1972-09-19
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Expires: 1989-11-04
Abstract
Abstract Methods and apparatus are provided for the simultaneous impartation and measurement of photoinitiated degradation of a plurality of resin samples by the application thereto of actinic radiation while continuously measuring the radiation passing through the resins so as to determine constantly the effectiveness quantitatively of different stabilizer components contained in the resins from initial exposure through the maximum rate of discoloration, and during a period of time substantially reduced from corresponding conditions produced under natural weather conditions. In addition, single means are provided for producing the radiation and the photodegradation, as well as means for constantly monitoring and measuring the radiation intensity alone and the degrading effects thereof on the resin samples, and under constantly maintained temperature conditions.
Inventors
- 👤 Hervey W Ackerman Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:53
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/33; G01N17/00; G01N17/004
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
43 words
Apparatus as described in claim 1 which also includes filter means disposed between said source and said samples and between said samples and said plurality of photocells for filtering and selecting the degree and range of the said radiation from the said source.
Claim 2
Dependent Claim
34 words
Apparatus as described in claim 1 in which said source is a medium pressure mercury arc lamp, and which also includes a reflector disposed adjacent said lamp for directing said radiation toward said samples.
Claim 3
Dependent Claim
59 words
Apparatus as described in claim 1 in which said temperature sensing means is a thermocouple, said fan means includes a heating element disposed in said flow communication between said fan means and said compartment, and which also includes a temperature control connected between said thermocouple and said heating element for controlling said heating element in response to said thermocouple.
Claim 4
Dependent Claim
41 words
Apparatus as recited in claim 1 which also includes a timer connected to said switch means for determining the time interval for activating the individual ones of said photocells, said timer having means for pre-selecting the length of said time intervals.
Claim 5
Dependent Claim
73 words
Apparatus as recited in claim 1 which also includes a sample holder for insertion into said compartment, said sample holder having a plurality of cut-out pockets disposed therein for insertion of a plurality of samples to be tested, and a baffle plate disposed between said photocells and said sample holder, said baffle plate having a plurality of openings therein arranged to correspond to said pockets and the respective photocells on opposite sides thereof.
Claim 6
Dependent Claim
101 words
In a method for testing the effectiveness of the stabilizer content of a plurality of resin samples against actinic radiation, the steps which comprise arranging a plurality of resin samples in a pattern in a testing zone, maintaining a pre-selected constant temperature in said testing zone, applying actinic radiation to said samples in said zone after the temperature thereof has reached said pre-selected temperature, sensing the said radiation passing through the said samples for pre-selected time intervals while said applying step is still being carried out, and recording the degree of radiation sensed in relation to the said pre-selected time intervals.
Claim 7
Dependent Claim
25 words
The method as described in claim 7 which includes the additional step of filtering the said radiation applied to said samples in said applying step.
Claim 8
Dependent Claim
34 words
The method as described in claim 7 in which said sensing step for sensing the said radiation passing through said samples is carried out simultaneously for said plurality of samples for pre-selected time intervals.
Claim 9
Dependent Claim
35 words
The method as described in claim 7 in which said sensing step for sensing the said radiation passing through said samples is carried out sequentially in pre-selected increments of time for each sample being sensed.
References Cited (Backward Citations)
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Cited
US2195726A
Cited
US2712415A
Cited
US2905646A
Cited
US3246150A
Cited
US3300643A
Cited
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Cited
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Cited
US3487209A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |