Inventor
John B. Letts
Inventor
Carmel, IN, US
Overview
Patents· 23 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
B32Bprimary
B32BLayered products, i.e. products built-up of strata of flat or non-flat, e.g. cellular or honeycomb, form13%
E04CStructural elements12%
E04DRoof coverings12%
B29CShaping or joining of plastics10%
B29KIndexing scheme associated with subclasses b29b, b29c or b29d, relating to moulding materials or to materials for moulds, reinforcements, fillers or preformed parts, e.g. inserts8%
C08JWorking-up8%
Y10TTechnical subjects covered by former us classification8%
C08GMacromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds6%
E04BGeneral building constructions6%
B29LIndexing scheme associated with subclass b29c, relating to particular articles4%
PatentTitleYear
10,870,987Isocyanate-based foam construction boards202010,611,066Process for encapsulating fragile insulation materials within polyisocyanurate202010,450,741Construction boards with coated inorganic facer201910,000,922Construction boards with coated inorganic facer20189,856,651'Fastening plate assembly'20189,221,234'High density polyurethane and polyisocyanurate construction boards and composite boards'20158,453,390'High density polyurethane and polyisocyanurate construction boards and composite boards'20138,153,039'Method for producing and monitoring the compressive strength of foam insulation board'20128,142,903'Construction boards with improved facers'20128,106,106'Insulation boards and methods for their manufacture'20127,987,730'Method and apparatus to monitor the compressive strength of insulation boards'20117,972,688'High density polyurethane and polyisocyanurate construction boards and composite boards'20117,838,568'Insulation boards and methods for their manufacture'20107,612,120'Insulation boards and methods for their manufacture'20097,387,753'Method and apparatus to monitor the compressive strength of insulation boards'20087,205,374'Two-part polyurethane adhesive for bonding insulation boards to a roof deck'20076,117,375'Roofing members without auxiliary facers and related methods'20006,044,604'Composite roofing members having improved dimensional stability and related methods'20005,950,383'Metal roof sealing system and method'19995,891,563'Polyisocyanurate boards with reduced moisture absorbency and lower air permeability and related methods'19995,735,092'Composite roofing members having improved dimensional stability and related methods'19984,739,122'Preparation of ketones'19884,490,559'Process for making aldehydes from diesters of carbonic acid'1984Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1984Based in Dunbar, WV, US· patent location history
1988Based in Charleston, WV, US· patent location history
1998–2000Patents assigned to BRIDGESTONE FIRESTONE INC (4)· patent assignee history
1998–2020Based in Carmel, IN, US· patent location history
2007–2010Patents assigned to BFS DIVERSIFIED PRODUCTS LLC (4)· patent assignee history
2011–2018Patents assigned to LETTS JOHN B (6)· patent assignee history
2011–2018Patents assigned to TACKETT TIMOTHY (3)· patent assignee history
2012–2020Patents assigned to FIRESTONE BUILDING PROD CO LLC (10)· patent assignee history
2015Based in Westfield, IN, US· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| FIRESTONE BUILDING PROD CO LLC | 10 | 2012–2020 |
| LETTS JOHN Bself | 6 | 2011–2018 |
| BFS DIVERSIFIED PRODUCTS LLC | 4 | 2007–2010 |
| BRIDGESTONE FIRESTONE INC | 4 | 1998–2000 |
| TACKETT TIMOTHY | 3 | 2011–2018 |
Locations
| Location | Patents | Span |
|---|---|---|
| Carmel, IN, US | 20 | 1998–2020 |
| Westfield, IN, US | 1 | 2015 |
| Charleston, WV, US | 1 | 1988 |
| Dunbar, WV, US | 1 | 1984 |