US4552818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicone encapsulant containing porphyrin
Assignee: AT&T Inc
•
Filing: 1984-05-10
•
Granted: 1985-11-12
•
Expires: 2004-05-10
Abstract
Abstract An encapsulant for an electronic device comprises a silicone resin having a highly colored porphyrin compound doped therein.
Inventors
- 👤 Ching-Ping Wong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:02
CPC Classifications
H; H10; H10W; H10W74/00; H10W74/40; H10W74/47; H10W74/476; C; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3467; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
56 words
An article of manufacture comprises an electronic device and an encapsulant thereover, said encapsulant being a polymeric silicone resin containing from 0.02 to 0.1 weight percent of a soluble colored, free porphyrin compound having a molar extinction coefficient to a wavelength in the visible spectrum of at least 1×10 4 liter mole -1 cm. -1 .
Claim 2
Dependent Claim
56 words
An article of manufacture comprises an electronic device and an encapsulant thereover, said encapsulant being a polymeric silicone resin containing from 0.02 to 0.1 weight percent of a soluble colored, free porphyrin compound having a molar extinction coefficient to a wavelength in the visible spectrum of at least 1×10 4 liter mole -1 cm. -1 .
Claim 3
Dependent Claim
12 words
The article recited in claim 1, wherein the porphyrin is a tetraphenylporphyrin.
Claim 4
Dependent Claim
47 words
The article recited in claim 1, wherein the porphyrin is represented by the structural formula: ##STR2## and wherein R 1 , R 2 , R 3 and R 4 are 1 to 7 carbon radicals selected from the group consisting of alkyl, phenyl and substituted phenyl radicals.
Claim 5
Dependent Claim
46 words
A composition of matter comprising a polymeric silicone resin containing from 0.02 to 0.1 weight percent of a soluble colored, free porphyrin compound having a molar extinction coefficient to a wavelength in the visible spectrum of at least 1×10 4 liter mole -1 cm. -1 .
Claim 6
Dependent Claim
46 words
A composition of matter comprising a polymeric silicone resin containing from 0.02 to 0.1 weight percent of a soluble colored, free porphyrin compound having a molar extinction coefficient to a wavelength in the visible spectrum of at least 1×10 4 liter mole -1 cm. -1 .
Claim 7
Dependent Claim
12 words
The composition recited in claim 4, wherein the porphyrin is a tetraphenylporphyrin.
Claim 8
Dependent Claim
47 words
The composition recited in claim 4, wherein the porphyrin is represented by the structural formula: ##STR3## and wherein R 1 , R 2 , R 3 and R 4 are 1 to 7 carbon radicals selected from the group consisting of alkyl, phenyl and substituted phenyl radicals.
References Cited (Backward Citations)
US2950237A
Cited
US2951799A
Cited
US2951798A
Cited
US3687863A
Cited
US3931026A
Cited
US4330637A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-11 | 1989-05-13 | 1989-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-11 | 1993-05-13 | 1993-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-11 | 1997-05-13 | 1997-11-12 | $7700.00 | Window Closed / Lapsed |