Robert Sprague has been granted 15 US patents while listed as an inventor at Materion . The first was granted in 1985 and the most recent in September 2025. Robert Sprague ranks #307,048 of 4,157,543 US inventors in our database (top 7.4%). Patent records list Robert Sprague in Acton, MA, US.
Patents per Year Patents granted per year, 1985 to 2025 Bar chart with a peak of 3 patents in 2022. peak 3 1985: 1 patents 1985 1987: 1 patents 1988: 1 patents 1988 1989: 1 patents 2017: 1 patents 2017 2018: 2 patents 2019: 2 patents 2019 2020: 1 patents 2022: 3 patents 2022 2024: 1 patents 2025: 1 patents 2025
Issued Patents All Time
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Showing 1–15 of 15 patents
Patent # Title Co-Inventors Date Approx Value ⓘ
12422605 Near infrared optical interference filters with improved transmission Shengyuan Bai 2025-09-23
12000033 Method of fabricating anisotropic optical interference filter — 2024-06-04
$15,840,000
11474422 Reflective color correction for phosphor illumination systems Michael Newell 2022-10-18
$5,712,000
11372144 Near infrared optical interference filters with improved transmission Shengyuan Bai 2022-06-28
$5,765,000
11365471 Method of fabricating anisotropic optical interference filter — 2022-06-21
$9,648,000
10871644 Enhancement of output of optically pumped phosphor by use of surface nanostructures Michael Newell 2020-12-22
$13,027,000
10502880 Method of fabricating anisotropic optical interference filter — 2019-12-10
$4,978,000
10437042 Enhancement of output of optically pumped phosphor by use of surface nanostructures Michael Newell 2019-10-08
$5,041,000
9989684 Near infrared optical interference filters with improved transmission — 2018-06-05
$7,067,000
9927369 Automated defect detection and mapping for optical filters — 2018-03-27
$6,252,000
9804310 Method of fabricating anisotropic optical interference filter — 2017-10-31
$3,198,000
4795349 Coded font keyboard apparatus Joan Sprague 1989-01-03
4768959 Method of teaching and transcribing of language through the use of a periodic code of language elements Joan Sprague 1988-09-06
4650423 Method of teaching and transcribing of language through the use of a periodic code of language elements Joan Sprague 1987-03-17
4515566 Flip card apparatus for forming units of speech — 1985-05-07